大学职业技能学习工具
下载APP
【单选题】
根据本题题干回答以下（1）（2）题
设连续型随机变量X的概率密度函数为
(1)、则常数k的值为
A.
1/2
B.
1/4
C.
1/6
D.
1/8
参考答案：
参考解析：
刷刷题刷刷变学霸
相关题目：
【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
【判断题】博彩的介入可以在一定程度上提升观众的观赛水平和体育赛事的趣味性。
A.
正确
B.
错误
【判断题】美国航母的舰载机可以从航母上起飞，去攻击1000千米之外的敌水面舰艇。
A.
正确
B.
错误
【单选题】(2)、$P(|X|>1)$的值为
A.
1/2
B.
1/4
C.
1/6
D.
1/8
【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】Literature shows the story with languages so that readers can have more _______.
A.
consideration
B.
depression
C.
imagination
D.
inspiration
【单选题】根据本题题干回答以下（1）（2）题设某电子元件寿命(单位：小时)的概率密度函数为(1)、试问a的值为
A.
50
B.
100
C.
150
D.
200
【多选题】儒家“六艺”中，( )和（ ）接近于今天的体育？
A.
礼
B.
乐
C.
射
D.
御
E.
书
F.
数
【单选题】在航母编队中最快、最远、效率最高的反潜兵力，是什么？
A.
固定翼反潜机
B.
反潜直升机
C.
潜艇
D.
驱逐舰
【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
【单选题】求lnx的不定积分为（）
A.
1/x+C
B.
lnx-1+C
C.
xlnx+C
D.
x(lnx-1)+C
【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
【判断题】判断:所有AVL树可以染成红黑树，所有红黑树都是AVL树
A.
正确
B.
错误
【单选题】What does “subtle” mean there?
A.
evident
B.
clear
C.
not obvious
D.
apparent
【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\}$
【单选题】$ \bigcup\limits_{n = 1}^\infty {(1 + \frac{1}{n},2 - \frac{1}{n})} = $ ( ).($\bigcup\limits_{n = 1}^\infty$表示n从1取到无穷相应的所有集合取并集)
A.
$(1,2)$
B.
$[1,2)$
C.
$(1,2]$
D.
$[1,2]$
【单选题】一批产品中有10%的不合格品，现从中任取3件，其中至多有一件不合格品的概率为？
A.
0.972
B.
0.729
C.
0.271
D.
0.243
【单选题】The root of a red-black tree is 红黑树的根节点的颜色是
A.
red 红
B.
black 黑
【单选题】2）该电路的Uom≈_____V。
A.
2.1
B.
3
C.
4.2
D.
6
【单选题】设集合$A=[-1,1], B=(0,2) $，则$A\backslash B =$ ( ).
A.
$[-1,0]$
B.
$[-1,0)$
C.
$(-\infty ,0]$
D.
$( - \infty ,0] \cup [2, + \infty ) $
【单选题】某射手命中10环的概率为0.7，命中9环的概率为0.3，则该射手射击3次所得的环数不少于29环的概率为
A.
0.784
B.
0.652
C.
0.875
D.
0.625
【单选题】若$A,B$为$R$中的非空有界集，记${M_1} = \inf \,(A \cup B),{M_2} = \min \{ \inf A,\inf B\},{N_1} = \sup \,(A \cup B), {N_2} = \max \{ \sup A,\sup B\} $,则 ( ).
A.
$M_1 < M_2, N_1 > N_2 $
B.
$M_1 = M_2, N_1 > N_2 $
C.
$M_1 < M_2, N_1 = N_2 $
D.
$M_1 = M_2, N_1 = N_2 $
【单选题】Choose the most appropriate answer by completing the sentences below or answering the questions.1. The book offers a(n) _______ glimpse of the lives of the very rich and famous.
A.
fascinating
B.
resistible
C.
dominating
D.
irritable
【单选题】The external nodes are 外部节点的颜色是
A.
red 红
B.
black 黑
【单选题】In a red-black tree of size n, the black height wouldn't exceed __规模为n的红黑树，黑高度不超过：
A.
O(1)
B.
O(lgn)
C.
O(n)
D.
O(nlgn)
【单选题】设X服从泊松分布，且已知P(X=1)=P(X=2),则P(X=4)=
A.
$0.0304$
B.
$0.0902$
C.
$0.0718$
D.
$0.0625$
【单选题】若$A,B$为$R$中的两个不同非空有界集，且$A \cap B$ 非空，记${M_1} = \inf \,(A \cap B),{M_2} = \max \{ \inf A,\inf B\},{N_1} = \sup \,(A \cap B), {N_2} = \min \{ \sup A,\sup B\} $,则 ( ).
A.
$M_1 \geq M_2, N_1 \leq N_2 $
B.
$M_1 > M_2, N_1 < N_2 $
C.
$M_1 < M_2, N_1 > N_2 $
D.
$M_1 = M_2, N_1 = N_2 $
【单选题】The height wouldn't exceed __ 高度不超过：
A.
O(1)
B.
O(lgn)
C.
O(n)
D.
O(nlgn)
【单选题】The weather there can be a bit _______- one minute it's blue skies and the next minute it's pouring down.
A.
likely
B.
unlikely
C.
predictable
D.
unpredictable
【单选题】若$a,b\in R$, 则$\max\{a,b\}$和$\min\{a,b\}$分别是 ( ).
A.
$\frac{{a + b + |a - b|}}{2},\frac{{a + b - |a - b|}}{2} $
B.
$\frac{{a - b + |a - b|}}{2},\frac{{a + b - |a - b|}}{2} $
C.
$\frac{{a + b - |a - b|}}{2},\frac{{a - b + |a - b|}}{2}$
D.
$\frac{{a + b + |a - b|}}{2},\frac{{a - b + |a - b|}}{2} $
【单选题】What is a 'double red' in a red-black tree? 在红黑树中，何为双红缺陷：
A.
the root is red 根节点为红色
B.
both the root and the external nodes are red 根节点和外部节点都为红色
C.
both a parent and its child are red 相邻的两个父子节点都为红色
D.
there are two red nodes in the tree 树中有两个红色节点
【单选题】根据本题题干回答以下（1）（2）题一批产品的不合格率为0.02，现从中任取40件进行检查，若发现两件或两件以上不合格品就拒收这批产品．分别用以下方法求拒收的概率：(1)、用二项分布作精确计算
A.
0.5543
B.
0.6362
C.
0.1905
D.
0.2364
【单选题】There seemed to be an _______ supply of champagne at the wedding.
A.
irrelevant
B.
irritable
C.
inexhaustible
D.
irresistible
【单选题】设某商店中每月销售某商品的数量X服从参数为7的泊松分布。那么在月初应进货多少件，才能保证当月不脱销的概率不小于0.90？
A.
8
B.
9
C.
10
D.
11
【单选题】Traveling is _______ more comfortable now than it used to be.
A.
finitely
B.
infinitely
C.
eternally
D.
long-lastingly
【单选题】What does “insomnia” mean?
A.
Lack of vitality.
B.
Lack of sleep.
C.
Loss of interest in food.
【单选题】接上题，电压放大倍数将_____，
A.
增大
B.
减小
C.
基本不变
【单选题】、用泊松分布作近似计算
A.
$1-1.8e^{-0.8}$
B.
$1-0.8e^{-0.8}$
C.
$1-e^{-0.8}$
D.
$1-2.12e^{-0.8}$
【单选题】根据本题题干回答以下（1）（2）题抛一枚均匀骰子(1)、首次出现6点为第三次抛掷的概率是
A.
25/216
B.
1/6
C.
5/36
D.
25/36
【单选题】接4题，输入电阻Ri将_____，
A.
增大
B.
减小
C.
基本不变
【单选题】函数$y = \sqrt {x - \sqrt x } + \sqrt {{2^x} - 4} $的定义域为 ( ).
A.
$[0,1] $
B.
$[1,2] $
C.
$[2,+\infty) $
D.
$[1,+\infty) $
【单选题】How does the topology changes when fixing a double red and the uncle node u is red.当叔父节点u为红色时，修正双红缺陷导致的红黑树拓扑结构的变化为：
A.
no change 没有变化
B.
it changes no more than O(1) 有变化，但是不超过O(1)
C.
it changes no more than O(lgn) 有变化，但是不超过O(lgn)
D.
it changes no more than O(n) 有变化，但是不超过O(n)
【单选题】函数$y = \frac{1}{{[x + 1]}} $(其中 $[x+1] $是取整函数)的定义域为 ( ).
A.
$(-\infty,-1) $
B.
$[0,+\infty) $
C.
$( - \infty , - 1) \cup [0, + \infty ) $
D.
$( - \infty , - 1] \cup (0, + \infty ) $
【单选题】Clearly, the hypothesis does need some _______, in the light of these surprising results.
A.
refinement
B.
refreshment
C.
retirement
D.
recruitment
【单选题】谁能帮我读文献？
A.
Pubmed
B.
F1000
C.
Scifinder
【单选题】接4题，输出电阻Ro将_____；
A.
增大
B.
减小
C.
基本不变
【单选题】In her writing, she _______ for a balance between innovation and familiar prose forms.
A.
striven
B.
strove
C.
stove
D.
stolen
【单选题】函数$y = |x| + |x - 1| - |4 - 2x| $的最小值和最大值分别是 ( ).
A.
$-4,\quad 3 $
B.
$-3, \quad 3 $
C.
$-3, \quad 4 $
D.
$-4, \quad 4 $
【单选题】设随机变量t服从参数为2的指数分布，求方程$x^{2}+tx+4=0$有实根的概率。
A.
$1-e^{-8}$
B.
$1-e^{-4}$
C.
$e^{-8}$
D.
$e^{-4}$
【单选题】There are many joint _______ between American and Japanese companies.
A.
ventures
B.
risks
C.
chances
D.
hazards
【单选题】接4题，当Rc减小时，静态电流IBQ将_____，
A.
增大
B.
减小
C.
基本不变
【单选题】程序编译时出现以下提示，是_____。[Warning] incompatible implicit declaration of built-in function 'printf'
A.
代码编写出错
B.
没将标准库string.h包含在代码中
C.
没将stdio.h包含在代码中
D.
没将math.h包含在代码中
【单选题】设非负实数$x,y$满足方程$(1 - x){y^2} = {x^3} $. 若$x = \frac{{{t^2}}}{{1 + {t^2}}} (t>0) $, 则 ( ).
A.
$y = \frac{{{t^3}}}{{1 + {t^2}}} $
B.
$y = \frac{{{t^3}}}{{{{(1 + {t^2})}^2}}} $
C.
$y = \frac{t}{{1 + {t^2}}} $
D.
$y = \frac{t}{{{{(1 + {t^2})}^2}}} $
【单选题】根据本题题干回答以下（1）（2）题随机变量$X\sim N(\mu,\sigma^{2})$，且密度函数如下(1)、$\mu$的值为？
A.
$\sqrt{2}$
B.
$-\sqrt{2}$
C.
2
D.
-2
打开"刷刷题APP"，使用更方便
打开APP