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【单选题】
根据本题题干回答以下(1)(2)(3)题
已知5只动物中有1只患有某种疾病,需要通过化验血液来确定患病的动物,血液结果呈阳性的即为患病动物,呈阴性的即没有患病。下面是两种化验方案:
方案甲 逐个化验,知道能确定患病动物为止
方案乙 先任取3只,将它们的血液混在一起化验。
若结果呈阳性则表明患病动物为这3只中的1只,然后再逐个化验,知道能确定患病动物为止;若结果呈阴性则在另外2只中任取1只化验。
(1)、求方案甲所需化验次数为2次的概率
A.
1/5
B.
2/5
C.
1/2
D.
3/5
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三
In the sinoatrial (SA) node, phase 4 depolarization (pacemaker potential) is attributable to( )
A.
An increase in K+ conductance
B.
A decrease in Ca2+ conductance
C.
An increase in Na+ conductance
D.
A decrease in Cl- conductance
E.
Simultaneous increases in K+ and Cl- conductance
Which is incorrect in the following description about the physiological properties of the digestive smooth muscle( )
A.
Sensitive to chemical, temperature and pulling stimuli
B.
Elastic
C.
With tension contraction
D.
A fast and regular automatic rhythm
E.
Low excitability and slow contraction
The False Statement about homeostasis is that( )
A.
An important way to maintain homeostasis is negative feedback
B.
The physical and chemical properties of internal environment are relatively constant
C.
Homeostasis is dynamic equilibrium maintained by a variety of controls
D.
Homeostasis is a fundamental characteristic of the internal environment
E.
The physical and chemical properties of the internal environment are absolutely constant
Which of the following occur during inhalation?( )
A.
Diaphragm relaxes, external intercostals contract, pleural pressure increases
B.
Diaphragm relaxes, pleural pressure decreases, internal intercostals relax
C.
Diaphragm and external intercostals contract, pleural and alveolar pressures decrease
D.
External and internal intercostals contract, pleural and alveolar pressure increase
E.
Diaphragm contracts, pleural pressure increases, alveolar pressure decreases
下列关于方丝弓矫治器矫治弓丝的说法正确的包括( )
A.
在方丝弓矫治器应用过程中,第二、第三阶段多使用方形弓丝
B.
所使用的弓丝的规格,亦取决于矫治的目的
C.
因不锈钢丝弹性较差,所以一般不用做方丝弓矫治器的矫治弓丝
D.
在方丝弓矫治器应用过程中,在第一阶段排齐牙齿的步骤中常使用圆形弓丝
E.
所使用的弓丝的规格,取决于使用托槽的槽沟规格
Which one yields the highest energy per gram( )
A.
Fat
B.
Protein
C.
Amino acids
D.
Carbohydrate
E.
Glucose
The resting potential is close to( )
A.
Cl-equilibrium potential
B.
Na+ equilibrium potential and K+ equilibrium potential
C.
K+ equilibrium potential
D.
Ca2+ equilibrium potential
E.
Na+ equilibrium potential
What is wrong in the statement about digestive innervation( )
A.
The sympathetic postganglionic fibers release norepinephrine
B.
Foreign nerves modulate internal nerves
C.
The nerves that control the digestive tract are all autonomic nervous systems
D.
Most parasympathetic postganglionic fibers release acetylcholine
E.
Local reflexes can still be completed after the removal of foreign nerves
The basic modes of neuroregulation is( )
A.
Reaction
B.
Reflection
C.
Adapt
D.
Feedback
E.
Excited
The maximum amount of air that can be expired after a maximum inspiration is: ( )
A.
Inspiratory reserve volume
B.
Expiratory reserve volume
C.
Tidal volume
D.
Vital capacity
E.
Total lung volume
Poor suspension stability of erythrocyte results in ( ).
A.
Blood coagulation
B.
Hemolysis
C.
Accelerated erythrocyte sedimentation rate
D.
Hemagglutination
E.
Decreased erythrocyte sedimentation rate
Which one of the following has the highest R.Q.( )
A.
Starch
B.
Malic acid
C.
Protein
D.
Glucose
E.
Fat
When cells are stimulated and excited, the absolute value of the membrane potential decreases, which is called( )
A.
Repolarization
B.
Reverse polarization
C.
polarization
D.
Depolarization
E.
Hyperpolarization
The basis of controlling the contractile rhythm of digestive smooth muscle is( )
A.
Slow wave
B.
Action potential
C.
Intramural plexus activity
D.
Sympathetic excitation
E.
Vagus nerve excitation
Which of the following lists includes only structures that compose the anatomic dead-space?( )
A.
Capillaries, respiratory bronchioles, alveolar ducts, alveoli
B.
Pharynx, bronchi, alveolar ducts, larynx
C.
Pharynx, nasal cavity, trachea, bronchi
D.
Respiratory bronchioles, alveoli, trachea, nasal cavity
E.
Capillaries, respiratory bronchioles, trachea, bronchi
The body's main mode of regulation( )
A.
Positive feedback regulation
B.
Neuromodulation
C.
Humoral regulation
D.
Self-regulation
E.
Negative feedback regulation
The accelerated erythrocyte sedimentation rate was caused by( )
A.
Haematocytosis
B.
Swelling of red blood cells
C.
Shrinkage of red blood cells
D.
Rupture of red blood cells
E.
Erythrocyte agglutination
The physiologic function of the relatively slow conduction through the atrioventricular node is to allow sufficient time for( )
A.
Repolarization of the ventricles
B.
Venous return to the atria
C.
Contraction of the ventricles
D.
Runoff of blood from the aorta to the arteries
E.
Filling of the ventricles
Name the structure of the nephron that reabsorbs the most substances.( )
A.
Collecting duct
B.
Distal convoluted tubule
C.
Proximal convoluted tubule
D.
Glomerular capsule
E.
Loop of Henle
The food with the most significant special dynamic effect is( )
A.
Dietary fiber
B.
Protein
C.
Fat
D.
Sugar
E.
Inorganic salt
The main components of nerve cell action potential are( )
A.
Negative after-potential
B.
Local potential
C.
Positive after-potential
D.
Peak potential
E.
Threshold potential
In the refraction system of the eye, the interface with the greatest refraction ability is( )
A.
Vitreo-retinal interface
B.
Posterior corneal surface -- aqueous humor
C.
Air -- anterior surface of cornea
D.
Posterior surface of lens -- vitreous body
E.
Aqueous humor -- anterior lens surface
Which of the following will decrease the rate of oxygen transfer between the alveolar air and the pulmonary capillary blood?( )
A.
Decreasing the mixed venous oxygen tension from 40 to 10 mmHg
B.
Destruction of alveolar septa and pulmonary capillaries by a disease known as alveolar emphysema
C.
Perfusing previously unperfused pulmonary capillaries
D.
None of the above
E.
Increasing PO2 in the alveoli from 100 to 500 mmHg
The important raw material for hemoglobin synthesis during erythropoiesis is( )
A.
Erythropoietin
B.
Folic acid and vitamin B12
C.
Intrinsic factor
D.
Protein and iron
E.
Androgen
When it is cold, thyroid hormone increases because of( )
A.
Neuro-humoral regulation
B.
Humoral regulation
C.
Feedback adjustment
D.
Self-regulation
E.
Neuromodulation
The thermal equivalent of oxygen of food is( )
A.
The energy released when food is oxidized to consume 1 liter of oxygen
B.
1 gram of energy released when food is oxidized
C.
1 gram of heat produced when food is burned outside the body
D.
1 gram of energy released by food during its metabolism in the body
E.
Energy released when 1 liter of oxygen is consumed by oxidizing 1 gram of food
When the fixator moves from far to near, the eye's regulatory response is( )
A.
Increased lens convexity, reduced pupil and convergence of optic axis
B.
Reduced lens convexity, reduced pupil and convergence of optic axis
C.
The convex degree of lens increases, the pupil shrinks, and the optic axis spreads
D.
Reduced lens convexity, dilated pupil and convergence of eyes
E.
Lens convexity increases, pupil dilates, and two eyes converge
The most commonly used indicators to judge the level of tissue excitability are( )
A.
Peak potential
B.
Duration of stimulation
C.
Threshold intensity
D.
Rate of time-intensity change of stimulus
E.
Threshold potential
The structure of nonchemical information transmission is( )
A.
the scrotum
B.
Effects of hormones on target organs
C.
Classical synapse
D.
Gap connection
E.
Nerve-muscle joint
Stimulation of the vagus nerve may cause( )
A.
Enhanced gastrointestinal movement and increased secretion of digestive juices
B.
It mainly causes enhancement of gastrointestinal motility
C.
Decreased gastrointestinal movement and secretion of digestive juices
D.
Weakened gastrointestinal movement and increased secretion of digestive juices
E.
Increased gastrointestinal movement and decreased secretion of digestive juices
The final stage of the blood coagulation process is( )
A.
FⅫ is activated
B.
The formation of fibrin
C.
Tissue releases FIII
D.
The formation of thrombin
E.
Formation of prothrombin activator
Which of the following could potentially result in more low V/Q regions within the lung?( )
A.
Obstruction of both pulmonary arteries
B.
None of the above
C.
Doubling the ventilation to the right cranial lobe while its blood flow remains the same
D.
Vasoconstriction of the pulmonary arteries of the left lung in a cow
E.
Atelectasis of one lobe of a dog lung
Under normal conditions, renal blood flow remains relative stable by( )
A.
Humoral regulation
B.
Feedback regulation
C.
Reflex
D.
Self-regulation
E.
Neuromodulation
The factors affecting both excitability and conductivity of myocardium are( )
A.
0 depolarization rate
B.
Duration of phase 2
C.
Resting potential level
D.
0 depolarization amplitude
E.
Rate of repolarization in phase 1
One of the things that you can store ATP in your body is( )
A.
Amino acids
B.
ATP
C.
ADP
D.
Glucose
E.
Creatine phosphate
Factors that increase glomerular filtration rate are( )
A.
Decreased glomerular capillary blood pressure
B.
Elevated arterial blood pressure throughout the body
C.
decreased osmotic pressure of plasma crystal
D.
Decreased plasma colloid osmotic pressure
E.
Increased hydrostatic pressure in renal vesicle
When nerve cells are excited, neurotransmitters are released from( )
A.
Axon
B.
Initial segment of axon
C.
Axon terminal
D.
Dendritic
E.
Cell body
The maintenance of body homeostasis mainly depends on( )
A.
Conditioned reflex
B.
Feedforward regulation
C.
Negative feedback regulation
D.
Positive feedback adjustment
E.
Short feedback regulation
An increase in the pH of blood will:( )
A.
Decrease the oxygen content of the blood
B.
Decrease the oxygen capacity of the blood
C.
Shift the oxyhemoglobin dissociation curve to the right
D.
Decrease P50
E.
Decrease the affinity of hemoglobin for oxygen
In the following choices, the unique form of movement of the stomach is( )
A.
Group creep
B.
Receptive relaxation
C.
Peristalsis
D.
Pocket movement
E.
Segmented movement
Which is not a protein in the following clotting factors( )
A.
Factors V and VII
B.
Factors I and II
C.
Factor VI
D.
Factor IV
E.
Factor X
The duration of effective refractory period of ventricular muscle depends mainly on( )
A.
The level of the end of an action potential repolarization
B.
The rate of the action potential depolarizes at phase 0
C.
The level of threshold potential
D.
Sodium-potassium pump function
E.
The duration of phase 2 of action potential
The basic structural units of skeletal muscle contraction and relaxation are:( )
A.
H band
B.
Light band
C.
Segment between two adjacent M lines
D.
dark band
E.
Sarcomere
Factors that promote energy metabolism increase include( )
A.
Mental stability
B.
The environment is hot
C.
Eating
D.
Muscle movements
E.
Cold environment
After the original urine passes through which of the following parts, its composition will not change and become final urine( )
A.
Distal convoluted tubules
B.
Collecting duct
C.
Descent branch of loop of medullary
D.
The ascending branch of loop medullary
E.
Proximal tubule
Which of the following is true about nearsightedness?( )
A.
Weak refraction of the eye can occur
B.
nearer than normal people
C.
Most of them are caused by too short anterior and posterior diameter of the eyeball
D.
Image behind the retina
E.
It is necessary to wear convex lens for correction
The following characteristics of synaptic transmission are stated correctly( )
A.
Non-summation
B.
Fast transmission speed
C.
Synaptic delay
D.
Bidirectional transmission
E.
Not easy to fatigue
The most effective digestive fluid for fat and protein digestion is( )
A.
Pancreatic juice
B.
Gastric juice
C.
Small intestinal juice
D.
Bile
E.
Saliva
Quantitatively, the most important form of carbon dioxide transport it?( )
A.
CO2 combined with plasma proteins
B.
HCO3- produced in erythrocyte
C.
CO2 dissolved in the erythrocyte
D.
HCO3- produced in plasma
E.
CO2 dissolved in plasma
Which antigen is on the erythrocyte membrane of type AB blood ( )
A.
A antigen
B.
Rh antigen
C.
D antigen
D.
A and B antigens
E.
B antigen
The wrong description about the role of the sympathetic nerve on the heart is that( )
A.
Beta receptors on the membrane of the heart muscle
B.
The transmitter released from the end is norepinephrine
C.
Increase ventricular end-diastolic volume
D.
Increase cardiac output
E.
It can accelerate heart rate and strengthen myocardial contractility
Which of the following organ activities is involved in maintaining homeostasis in the internal environment( )
A.
The digestion and absorption of the digestive system
B.
Excretory function of the kidney
C.
Contraction of skeletal muscle
D.
Respiration
E.
Blood circulation
The conditions for determining basal metabolic rate are( )
A.
Fasted at least 12 hours prior to measurement
B.
Take a seat during measurement
C.
Measured shortly after waking in the morning
D.
Keep the room temperature between 20℃ and 25℃
E.
Keep emotion quiet
The site of glucose reabsorption in the kidney is at( )
A.
Thick ascending branch of loop of medullary
B.
Proximal tubule
C.
Loop of medullary loop
D.
Distal convoluted tubules and manifolders
E.
Thick segment of descending branch of loop of medullary
The energy required for K+ outflow generating the resting potential comes from( )
A.
Electrochemical gradient
B.
Potential gradient
C.
Concentration gradient of Na+ across membrane formed by active transport of Na+ pump
D.
ATP
E.
Its own transmembrane concentration gradient
The somatosensory cortex locates mainly at( )
A.
Anterior central gyrus
B.
Temporal cortex
C.
Limbic system
D.
posterior central gyrus
E.
Insular cortex
The main cause of presbyopia is( )
A.
Increased corneal curvature
B.
Weakened lens elasticity
C.
Changes in corneal transparency
D.
Lens opacity
E.
Poor aqueous humor circulation
The rhythmicity of breathing is thought to originate solely in the:( )
A.
Dorsal respiratory group of medullary neurons
B.
Apneustic center
C.
Ventral respiratory group of medullary neurons
D.
Rapidly adapting pulmonary stretch receptors
E.
Pons
Secreting endogenous factors is( )
A.
Stem cells
B.
Chief cells
C.
Myxocytes
D.
Wall cells
E.
G cells in the gastric pylorus
The main characteristics of ventricular myocyte action potential are( )
A.
Phase 4 is the resting period
B.
Formation of phase 2 platform
C.
0 depolarization is slow
D.
No obvious phase 1
E.
Phase 4 automatic depolarization
What is true about the physiological description( )
A.
The object of study is organism
B.
Belonging to a branch of biology
C.
It is not only a basic medical subject, but also an experimental subject
D.
The normal physiological function of the body
E.
Study the laws of physical movement in the body
Which is correct in the following statement about HCO3- proximal tubule reabsorption( )
A.
Coupling with H+ secreted by tubules
B.
Reabsorption in the form of HCO3-
C.
It is not associated with Na+ reabsorption
D.
The reabsorption rate is about 67%
E.
Lagging behind the reabsorption of Cl-
The maximum action potential is generated when the cell is properly stimulated( )
A.
Normal period
B.
Subnormal period
C.
Relative refractory period
D.
Supernormal period
E.
Absolute refractory period
Hormones that promote gastric secretion and gastric motility are ( ).
A.
Pancreatic polypeptide
B.
Cholecystokinin
C.
Gastrin
D.
Trypsin
E.
Gastric inhibitory peptides
The functions of cone cells are( )
A.
High visual acuity
B.
There is only one visual pigment
C.
Distinguish the colors of objects
D.
Poor sensitivity to light
E.
Photopic vision
The following components associated with ESR are( )
A.
Plasma
B.
the platelet
C.
Red blood cells
D.
White blood cells
E.
Monocytes
The main function of the specific projection system of the thalamus is( )
A.
Maintain awareness
B.
Regulate visceral function
C.
Coordination muscle tension
D.
Cause specific feelings
E.
Cause referred pain
The concentration of hormones in the blood is extremely low, but the physiological effects are very obvious because( )
A.
Hormones are distributed throughout the body along with the blood
B.
high specificity of hormone
C.
Hormones have very long half-lives
D.
There is a highly efficient bioamplification system in cells
E.
Long duration of hormone secretion
All the following shift the oxyhemoglobin dissociation curve to the right except: ( )
A.
An increase in PCO2
B.
An increase in PCO
C.
Increase in 2, 3-DPG
D.
An increase in the concentration of H+ in blood
E.
An increase in temperature
Which can measure cardiomyocyte autorhythmicity( )
A.
The level of threshold potential
B.
Maximum repolarization potential level
C.
Amplitude of the action potential
D.
Rate of depolarization in phase 0
E.
Rate of automatic depolarization in phase 4
Belongs to the internal environment is( )
A.
Urine
B.
Cerebrospinal fluid
C.
Plasma
D.
Lymph
E.
Interstitial fluid
Which is correct about the following description of ADH( )
A.
When the osmotic pressure of plasma crystal increases, its release volume decreases
B.
Synthesized and secreted by the neurohypophysis
C.
When arterial blood pressure decreases, its release volume increases
D.
When circulating blood volume increases, its release volume increases
E.
Improve water reabsorption by proximal tubules
In the depolarization phase of nerve cell action potential Na+ transport belongs to( )
A.
Primary active transport
B.
Secondary active transport
C.
Exocytosis
D.
Facilited diffusion
E.
Simple diffusion
The final road of somatic motor reflex refers to( )
A.
β neurons in the anterior horn of the spinal cord
B.
γ neurons in the anterior horn of spinal cord
C.
Spindle external muscle fibers
D.
motor neurons in the cerebral cortex
E.
α neurons in the anterior horn of the spinal cord
The mechanism of glucose absorption in the small intestine is ( )
A.
Simple diffusion
B.
Simple diffusion
C.
Endocytosis
D.
Active transshipment
E.
Penetration
The statement about nearsightedness is correct( )
A.
It can be corrected with cylindrical mirror
B.
Suitable concave lens can be worn for correction
C.
Most of them are caused by excessive length of anterior and posterior diameter of the eyeball
D.
Far point is closer than the eye
E.
Near point is farther than emmetropia
Which is incorrect The following statement about plasma( )
A.
The main components of plasma are crystalline substance and plasma proteins
B.
Plasma is the liquid separated from coagulated blood
C.
Plasma contains fibrinogen
D.
The protein content in plasma is significantly higher than that in tissue fluid
E.
Plasma is free of Ca2+ and other electrolytes
What does not belong to the function of growth hormone is( )
A.
Promote protein synthesis
B.
Increase blood sugar level
C.
Promote the growth and development of cartilage
D.
Promote brain cell growth and development
E.
Promote fat storage
The prime motivity of lung ventilation is( )
A.
Differential gas partial pressure
B.
Intrapulmonary and pleural pressure
C.
Pressure difference between the pleural pressure and the external environment
D.
Rhythmic breathing movement caused by relaxation and contraction of respiratory muscles
E.
Pressure difference between the pulmonary pressure and the external environment
What is true about the description of humoral regulation( )
A.
Quick and accurate
B.
Slow action
C.
Low sensitivity
D.
Large scope of action
E.
Long duration of action
During the cardiac cycle, the left ventricular pressure increased sharply in( )
A.
Rapid ejection phase
B.
Atrial systole
C.
Isovolumetric systole
D.
Slow ejection phase
E.
Rapid filling period
The physiological function of renal parabulbar cells is( )
A.
Secretion of angiotensin
B.
Secretion of prostaglandins
C.
Secretion of aldosterone
D.
Secretion of erythropoietin
E.
Secrete renin
The outflow of K+ during an action potential is called( )
A.
Polarization
B.
Hyperpolarization
C.
Depolarization
D.
Reverse polarization
E.
Repolarization
Which is correct in the following description about gastric acid( )
A.
Denature protein in food and decompose it easily
B.
Sterilization
C.
Promote the absorption of vitamin B12
D.
Activate pepsinogen
E.
Promote the secretion of digestive juices
The basic center of the stretch reflex is located at( )
A.
The medulla oblongata
B.
The spinal cord
C.
The midbrain
D.
Cerebral cortex
E.
The hypothalamus
About the description of physiological hemostasis mechanism, Which of the following is correct( )
A.
Prolonged bleeding time with thrombocytopenia
B.
Short duration of local vasoconstriction reaction
C.
Platelets are involved in the formation of thrombosis and blood clots
D.
Including local vasoconstriction, preventing thrombosis and blood coagulation
E.
Coagulation time is significantly shortened with thrombocytopenia
The most important hormone affecting nervous system development is( )
A.
Adrenaline
B.
insulin
C.
Thyroid hormone
D.
aldosterone
E.
Growth hormone
The heart index is equal to( )
A.
Heart rate × body surface area/cardiac output
B.
Cardiac output/body surface area
C.
Stroke output/body surface area
D.
Heart rate × stroke output/body weight
E.
Returned blood volume/body surface area
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D.
BufferedReader的readLine()函数,如果没有数据时会返回0
【单选题】What's the 'overflow' for a B-tree?B树的上溢是指:
A.
The property of a B-tree is violated due to removing a key 删除关键码后违反了B树的性质
B.
The property of a B-tree is violated due to inserting a key 插入新的关键码后违反了B树的性质
C.
The property of a B-tree is violated due to a split 分裂后违反了B树的性质
D.
A B-tree becomes too high B树的高度过高
【单选题】设随机变量服从区间(0,2)上的均匀分布,则$Y=X^{2}$在(0,4)上的密度函数为()
A.
$\frac{1}{3\sqrt{y}}$
B.
$\frac{1}{\sqrt{y}}$
C.
$\frac{1}{2\sqrt{y}}$
D.
$\frac{1}{4\sqrt{y}}$
【单选题】Which consequence follows as a B-tree becomes higher?B树高度的增加一定伴随着:
A.
Each node has a larger number of keys 每个节点所存放的关键码数量增加
B.
Each node has a smaller number of keys 每个节点所存放的关键码数量减少
C.
Splitting to the root 分裂到根
D.
Splitting to the leaves 分裂到叶
【多选题】Gardening is ______.
A.
a great daily exercise
B.
a great way to keep your lawn beautiful
C.
a great way to keep you healthy
D.
landscape painting
【单选题】Choose the most appropriate answer by completing the sentences below or answering the questions.1. Why is Billy a bit disappointed about the film?
A.
The quality of the film is comparable with the novel itself.
B.
The movie is unbelievable, for the plot is not true to the novel.
C.
The stories producers and directors tell are unbelievable.
D.
While adapting the original novels into films, producer exaggerated too much.
【单选题】The differences between the original novel and their adapted film depend on _______, _______ and _______.
A.
writers; actors; audience
B.
writers; actors; producers
C.
directors; actors; audience
D.
directors; producers; audience
【单选题】The underflow of a B-tree happens whenB树的下溢发生于:
A.
the height of the tree decreases B树高度减少
B.
the property of the B-tree is violated due to inserting a key 插入关键码后违反了B树的性质
C.
the property of the B-tree is violated due to deleting a key 删除关键码后违反了B树的性质
D.
inserting a key to a leaf node 在叶节点插入关键码
【单选题】The height of a B-tree decreases only whenB树高度的减少只会发生于
A.
merging two children of the root 根节点的两个孩子合并
B.
removing the root 根节点被删除
C.
rotating the root 根节点发生旋转
D.
there are multiple keys in the root 根节点有多个关键码
【单选题】Why do Amanda and Zheyu feel very down today?
A.
They are worried about homework.
B.
They are worried about exams.
C.
They are worried about interviews.
【多选题】以下哪种说法是正确的——
A.
人生观是对人生目的、意义的根本看法
B.
世界观是人生观重要组成部分
C.
价值观是人生哲学的核心,是人与人之间对于人生价值的不同看法
D.
哲学只是关于世界观的学问
【单选题】What does “be apt to do something” mean?
A.
be more likely to do something
B.
be angry to something
C.
be happy to do something
D.
be taught to do something
【多选题】A node in a red-balck tree could be红黑树节点的颜色有
A.
red 红
B.
black 黑
C.
yellow 黄
D.
blue 蓝
E.
green 绿
F.
purple 紫
【多选题】被称为中国新四大发明的有哪些?
A.
网络购物
B.
支付宝
C.
高铁
D.
抖音
E.
拼多多
F.
共享单车
【单选题】What does “turn out” imply?
A.
The reason for doing something.
B.
Something happens in that way or has the result the consequence of something.
C.
The potential risk of doing something.
D.
The original plan of doing something.
【单选题】What's unique about red-black trees compared to AVL trees? 红黑树相比于AVL树的特点是:
A.
The balance factor of each node falls within [-1, 1] 每个节点的平衡因子的绝对值不超过1
B.
It is a balanced binary search tree 是平衡二叉搜索树
C.
The search time is O(lgn) 支持O(lgn)时间的查找
D.
The topology changes no more than O(1) after each insertion/deletion每次插入/删除后拓扑结构的变化不超过O(1)
【单选题】You may choose one or more than one correct answer(s).1. Why is the student coming for the teacher?
A.
He quarreled with his classmates.
B.
He was stressed about the college entrance examination.
C.
He missed several classes due to illness
D.
He was often stressed when he faced an academic problem.
【多选题】好的选题从哪里来?
A.
知己知彼:你对一个领域的了解程度会直接影响你的选题
B.
现实需求:真正来自现实生活的需求最有生命力(洞察力)
C.
长期思考:有的问题需要多年的思考
D.
宽广胸怀:一个人的出发点直接决定了选题可能的高度
E.
好的选题非一日之功
【单选题】下列集合中,有最大值的集合是 ( ).
A.
$ \{x|x\in (0,1),x\in Q\} $
B.
自然数集
C.
有限个数构成的集合$ \{a_1,a_2,\cdots,a_n\} $
D.
$ \{x\in R|x^2-2x-3 < 0\}$
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