大学职业技能学习工具
下载APP
【单选题】
$\lim_{n \rightarrow \infty} \sqrt[n] n = $A.
0
B.
1
C.
不存在
D.
$\infty$
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
下列对气化炉气化技术特点描述错误的是（ ）
A.
气化炉以干煤粉为原料
B.
该技术采用高温气化技术，气化温度在煤的灰熔点以上
C.
采用余热锅炉流程回收煤气中的热量
D.
气化过程中产生的对环境有影响的副产物少
以下不是气化装置开车前的准备和检查工作的是
A.
所有设备经有关人员确认好用，水冷壁循环水泵等手动盘车正常
B.
开工烧嘴火焰观测孔已清理干净
C.
用于接收灰渣、细渣浆、合成气等的下游单元及火炬系统还未处于备用状态
D.
加药系统准备就绪
当DCS切断阀出现“上红下灰”的情况时，表示 。（ ）
A.
阀门关命令发出，阀门出现故障反馈
B.
阀门关命令发出，阀门尚未关到位
C.
阀门开命令发出，阀门尚未开到位
D.
阀门开命令发出，阀门出现故障反馈
当单套气化炉、两套气化炉、单烧嘴跳车时，PV1284的阀位应分别手动给至 ， ， 以便稳定高压氮气管网压力。（ ）
A.
50-60%，70-80%，30-35%
B.
40-50%，70-80%，10-15%
C.
40-50%，80-90%，20-25%
D.
30-40%，50-60%，30-35%
相关题目：
【单选题】甲乙两艘船驶向一个不能同时停泊两艘船的码头，它们在一昼夜内到达的时间是等可能的。如果甲船的停泊时间是一小时，乙船的停泊时间是两小时，求它们中任何一艘都不需要等候码头空出的概率是多少？
A.
$\frac{1009}{1152}$
B.
$\frac{1011}{1152}$
C.
$\frac{1013}{1152}$
D.
$\frac{1015}{1152}$
【单选题】Together with _______, Ms. Yang conducted an analysis of long and difficult sentences, which might be difficult but really useful for us to understand this text.
A.
Zuo Wan and Zixiao
B.
Zuo Wan and Yuege
C.
Yunpeng and Yuege
D.
Yunpeng and Zixiao
【单选题】In the Student Research Project, in which Alex, Abbas, Jiehan and Huanrui had a deeper discussion on the topic of _______.
A.
intelligence across cultures
B.
pop culture in the Arab world
C.
academic writing skills
D.
getting along verbally and non-verbally
【单选题】Choose the most appropriate answer by completing the sentences below or answering the questions.1. Which of the following statement is NOT true?
A.
Alex prefers to stay indoors, because he feels discomfort.
B.
Alex prefers to stay indoors, because he wants to read novels.
C.
His eyes hurt, because it is heavily polluted in Beijing.
D.
Alex has a sore throat.
【单选题】根据本题题干回答以下（1）（2）题某班级学生的考试成绩数学不及格的占15%，语文不及格的占5%，这两门课都不及格的占3%（1）已知一学生数学不及格，他语文也不及格的概率是多少？
A.
0.2
B.
0.375
C.
0.5
D.
0.6
【单选题】下面结论正确的是
A.
$\lim_{x \to a} f(x)$不存在,则该点$f(x)$没有定义
B.
如果$f(x)$连续且$f(a)=0$,那么$x \to a$时,$\frac{1}{|f(x)|} \to +\infty$.
C.
极限存在不一定唯一
D.
数列的子列收敛则数列一定收敛
【单选题】在平面上画有间隔为$d$的等距平行线，向平面任意投掷一个边长为$a,b,c$（均小于$d$）的三角形，求三角形与平行线相交的概率
A.
$\frac{a+2b+c}{2{\pi}d}$
B.
$\frac{a+b+c}{{\pi}d}$
C.
$\frac{a+b+2c}{{\pi}d}$
D.
$\frac{a+b+c}{2{\pi}d}$
【单选题】$\lim_{N\to \infty } \, \left(\sum _{n=1}^N \frac{1}{n!}\right)$
A.
$e$
B.
$e-1$
C.
$\infty$
D.
$2e$
【单选题】以某种动物由出生活到10岁的概率为0.8，而活到15岁的概率为0.5，问现年为10岁的这种动物能活到15岁的概率是多少？
A.
1/2
B.
3/8
C.
5/8
D.
7/8
【单选题】设10件产品中有4件不合格品，从中任取两件，已知其中一件是不合格品，求另一件也是不合格品的概率为
A.
0.1
B.
0.15
C.
0.2
D.
0.25
【单选题】$\lim_{x\to 0} \, x \cos \left(\frac{1}{x}\right)$
A.
1
B.
$\infty$
C.
不存在
D.
0
【单选题】$\lim_{x\to 1^+} \, \tan ^{-1}\left(\frac{1}{1-x}\right)$
A.
${\pi}$
B.
$\frac{\pi}{2}$
C.
$-\frac{\pi}{2}$
D.
$-{\pi}$
【单选题】People with different educational experiences may develop different ______.
A.
language proficiency
B.
characteristics
C.
personalities and abilities
D.
friendship
【单选题】Which property of data access is taken advantage of by splay trees?伸展树利用了实际问题中数据访问的何种特点：
A.
massiveness 大量性
B.
locality 局部性
C.
holisticity 整体性
D.
diversity 多样性
【单选题】Researchers used technologies such as MRI to study _____ and _____ of human brain for boys and girls at different stages.
A.
the structure; function
B.
the composition; role
C.
the structure; size
D.
the chemistry; volume
【单选题】Choose the most appropriate answer by completing the sentences below or answering the questions.1. Boys and girls are different in developmental process. Which of the following statement is true?
A.
The psychological development of boys is faster than that of girls.
B.
The brain development of girls is faster than that of boys.
C.
The physical development of girls is faster than that of boys.
D.
The mental development of boys is faster than that of girls.
【单选题】Which operation is executed for each accessed node in a splay tree?伸展树每次访问过某节点后都会把该节点：
A.
removing it 删除
B.
moving it to the higer level 上移一层
C.
moving it to the root 移动到根节点
D.
accessing it again 再次访问该节点
【单选题】Where do they often exercise?
A.
In the school playground.
B.
In the gymnasium.
C.
Go to the local sport center.
D.
In a fitness club with personal training services
【单选题】下列说法错误的是:()
A.
生命教育就是以生命为核心,以教育为手段,倡导认识生命、珍惜生命、尊重生命、爱护生命、享受生命、超越生命的一种提升生命质量、获得生命价值的教育活动;
B.
生命教育,就是在生命活动中,通过生命活动和为了生命而进行的教育;
C.
生命活动不是实践活动;
D.
生命教育是为了生命而进行的教育。
【单选题】关于枚举定义说法正确的是：
A.
定义枚举的关键字是：class
B.
枚举中只能有常量
C.
枚举是一种特殊的类，因为它的对象的个数是有限的
D.
枚举中不能定义抽象方法
【单选题】设一批产品中一、二、三等品各占60%, 35%, 5%．从中任意取出一件，结果不是三等品，求取到的是一等品的概率．
A.
3/5
B.
12/19
C.
5/19
D.
10/19
【单选题】$\lim_{x\to 0} \, \frac{2 x+3}{x+1}$
A.
2
B.
3
C.
$\frac{1}{2}$
D.
$\frac{1}{3}$
【单选题】n个灯泡中有一个是坏的（假设无法从外观分辨出好坏），现在有n个人去挑选，求第二个人挑到坏灯泡的概率为？
A.
1/2
B.
1
C.
1/(n-1)
D.
1/n
【单选题】$\lim_{n \to \infty } (\frac{2}{3})^n$
A.
1
B.
0
C.
$\infty$
D.
不存在
【单选题】约翰·菲斯克把文化的生产力分为（ ）类？
A.
1
B.
2
C.
3
D.
4
【单选题】What's the amortized complexity for a single splay operation in Tarjan's algorithm?按照Tarjan的伸展算法，单次伸展操作的分摊复杂度为：
A.
O(1)
B.
O(lgn)
C.
O(n)
D.
O(nlgn)
【单选题】在本节中，我们学过了如何将中缀表达式转化为逆波兰表达式，那么反过来，思考一下如何将逆波兰表达式还原为中缀表达式呢？试将下列逆波兰表达式还原为中缀表达式：1 2 + 3 4 ^ *
A.
(1-2)*3^4
B.
(1+2)*3^4
C.
(1+2)^3*4
D.
(1+3)*2^4
【单选题】、若取出的鞋子不合格，试求它是有乙车床加工的概率是
A.
0.5
B.
0.44
C.
0.67
D.
0.04
【单选题】、顾客买下的那箱没有次品的概率为
A.
0.325
B.
0.758
C.
0.675
D.
0.766
【单选题】双层伸展策略优于逐层伸展策略的关键在于（）
A.
zig-zig/zag-zag
B.
zig-zag/zag-zig
C.
zig-zig/zig-zag
D.
以上均是
【单选题】A splay tree degenerates into a list. What's its height after accessing the lowest node?在一棵退化成单链的伸展树中访问其最深的节点，经过伸展后树高大约为原先的：
A.
one third of the original height 三分之一
B.
half of the original height 一半
C.
the original height 不变
D.
twice the original height 两倍
【单选题】“Nevertheless” is a useful word, which means _______.
A.
never
B.
hardly ever
C.
despite what has just been said or referred to
D.
seldom
【单选题】Choose the most appropriate answer by completing the sentences below or answering the questions.1. Which of the following is not mentioned in this dialogue? The differences in adolescence and adult ar...
A.
thoughts, ways of doing things
B.
ways of doing things, attitudes towards her parents
C.
my attitudes towards my parents
D.
my attitudes towards my teachers
【单选题】The node accessed is a right-child, and so is its parent. What should we do for a single splay operation?所访问的节点及其父亲都是右孩子，则双层伸展要执行的操作是：
A.
zig-zag
B.
zag-zig
C.
zig-zig
D.
zag-zag
【单选题】下面的说法正确的是
A.
abstract可以修饰字段、方法和类
B.
抽象方法的body部分必须用大括号包住，但是需要为空
C.
声明抽象方法，大括号可有可以没有
D.
抽象方法没有方法体
【判断题】禅宗提倡以“明心见性”为宗旨。
A.
正确
B.
错误
【单选题】I could hear the ______ of Mozart in the background.
A.
delight
B.
strains
C.
amusement
D.
pleasure
【单选题】、A, B, C三个元件并联；
A.
0.012
B.
0.328
C.
0.448
D.
0.552
【单选题】Thinking angry thoughts can ______ strong physiological arousal.
A.
increase
B.
evolve
C.
provoke
D.
elicit
【单选题】根据本题题干回答以下（1）（2）题假设P (A) = 0.4，P (A∪B) = 0.9，在以下情况下求P (B)：（1）A, B不相容；
A.
0.5
B.
0.6667
C.
0.8333
D.
0.9
【单选题】The children’s excitement is _____ as Christmas gets nearer.
A.
mounting
B.
escalating
C.
amounting
D.
descending
【单选题】、元件A与两个并联的元件B及C串联而成（即B与C并联，然后再与A串联）
A.
0.012
B.
0.328
C.
0.448
D.
0.552
【单选题】The recession has forced a lot companies to cut down on graduate ( ).
A.
recruitment
B.
enrolment
C.
arrangement
D.
deployment
【单选题】若所有print方法均为static，则其结果输出为
A.
Manager Employee
B.
Person Person
C.
Manager Person
D.
Person Manager
【单选题】$\lim_{x\to 5} \, \frac{x-2}{x-8}$
A.
$-1$
B.
0
C.
$1$
D.
$5$
【单选题】A, B独立
A.
0.5
B.
0.6667
C.
0.8333
D.
0.9
【单选题】$\lim_{x\to \frac{\pi }{3}} \, \frac{\sin (x)}{\cos (x)+1}$
A.
$\frac{1}{\sqrt{3}}$
B.
$-\frac{1}{\sqrt{3}}$
C.
$\frac{1}{2}$
D.
$-\frac{1}{2}$
【单选题】Why does the memory becomes smaller and smaller?内存“越来越小”的原因是：
A.
With more and more processes running on one computer, the average memroy size for each process is getting smaller 机器上运行的程序越来越多，平均每个程序使用的内存变小
B.
The real-world applications call for rocketing memory storage 实际应用对存储的需求急剧增长
C.
The silicon used for producing chips is soon running out 用于制造内存芯片的硅资源消耗殆尽
D.
The physical size of memory chips is getting smaller thanks to the advances in technology 随着工艺的进步，内存的体积变小，集成度变高
【判断题】双航母编队主要使用于中等威胁区实施威慑、消除危机和遂行战斗任务。
A.
正确
B.
错误
【单选题】、求方案乙所需化验次数为2次的概率
A.
1/5
B.
2/5
C.
1/2
D.
3/5
【单选题】How to engage in other people’s discussion in a seminar when you are not fully prepared?
A.
Follow the lecture closely and look for opportunities to ask relevant questions.
B.
Pretend you’re fully prepared and listen carefully
C.
Ask people around for help
D.
Record all the lecture and learn it later by yourself
【单选题】$\lim_{x\to 1} \, \frac{x^3-1}{x^4-1}$
A.
$1$
B.
$\frac{3}{4}$
C.
$\frac{4}{3}$
D.
$-1$
【判断题】运动本身就是一种社交。
A.
正确
B.
错误
【单选题】The baby carrying the DNA of three parents is an experimental specimen, aiming at ______.
A.
having more babies
B.
having babies with genetic modification
C.
eliminating genetic diseases in newborns
D.
innovating in the field of life science
【多选题】判断一个国家或地区体育人口的标尺，有哪三个关键变量？
A.
生产力
B.
频度
C.
持续时间
D.
强度
【单选题】$\lim_{x\to 0} \, \frac{(x+1)^{\frac{1}{n}}-1}{x}$
A.
0
B.
1
C.
$n$
D.
$\frac{1}{n}$
【单选题】、求依方案甲所需化验次数不少于依方案乙所需化验次数的概率
A.
0.8
B.
0.72
C.
0.64
D.
0.56
【单选题】$\lim_{x\to \infty } \, \frac{\sqrt{x^2+3}}{2 x-5}$
A.
1
B.
0
C.
2
D.
$\frac{1}{2}$
【单选题】B-trees are 树结构上的特点是：
A.
short and chubby, with each node having at most two children矮胖，每个节点至多两个孩子
B.
short and chubby, with each node having potentially many children矮胖，每个节点可有多于两个孩子
C.
tall and slim, with each node having at most two children瘦高，每个节点至多两个孩子
D.
tall and slim, with each node having potentially many children瘦高，每个节点可有多于两个孩子
【单选题】In the Student Research Project part, in which ______ had a deeper discussion on the intriguing topic of “the world’s first baby born with the DNA from 3 parents”.
A.
Alex, Abbas, Alice and Ruohui.
B.
Alex, Abbas, Jiehan and Billy.
C.
Alex, Abbas, Alice and Saba.
D.
Alex, Abbas, Jiehan and Huanrui.
【单选题】B-trees have small height so as to B树的层数少有助于：
A.
reduce the number of I/O operations 减少I/O次数
B.
reduce the time consumption for a single I/O 减少每次I/O的时间
C.
reduce the asymptotic time complexity for seaching 降低查找的渐进时间复杂度
D.
reduce the storage requirement 节省存储空间
【单选题】随机变量的分布函数是右连续函数。
A.
错误
B.
正确
【单选题】In the Academic Writing part, Alex discussed with Ruoqi on academic skills, such as ______.
A.
plagiarism, paraphrasing and summarizing
B.
plagiarism, paraphrasing and synthesizing
C.
how to avoid plagiarism, paraphrase and summarize
D.
how to avoid plagiarism, paraphrase and synthesize
【单选题】$\lim_{n\to \infty } \, e^{-n}$
A.
0
B.
1
C.
-1
D.
$\infty$
【单选题】If it would take us a second for a single memory access, how long would it cost for a single access to the external storage?如果说访问一次内存需要1秒，则一次外存访问大概需要：
A.
a hour 1小时
B.
a day 1天
C.
a month 1月
D.
a year 1年
【单选题】$\lim_{x\to \infty } \, \left(\sqrt{x+\sqrt{x+\sqrt{x}}}-\sqrt{x}\right)$
A.
$0$
B.
$1$
C.
$\frac{1}{2}$
D.
$2$
【单选题】$\lim_{n\to \infty } \, \frac{\ln (n)}{\ln (3 n)}$
A.
$\frac{1}{3}$
B.
$3$
C.
$1$
D.
不存在
【单选题】$\lim_{n\to \infty } \, \cos (\pi n)$
A.
1
B.
0
C.
-1
D.
不存在
【单选题】$\lim_{x\to -\infty } \, \frac{e^x-e^{-x}}{e^x+e^{-x}}$
A.
1
B.
-1
C.
0
D.
$+\infty$
【多选题】运动休闲可以（ ）。
A.
减轻医疗负担
B.
增强抵抗力
C.
减少疾病
D.
促进心理健康
E.
缓解精神压力
【单选题】Through the group discussion between ______ , we figured out the differences between adolescence and adulthood.
A.
Abbas, Zuowan and Jialin
B.
Billy, Xuanhui and Jialin
C.
Abbas, Xuanhui and Jialin
D.
Billy, Xuanhui and Zixiao
【单选题】In the main part of Text A, ______ showed us some opinions on the relationship between musical experiences and intelligence.
A.
Kamlesh
B.
Jason
C.
John
D.
Abbas
【单选题】What's the time complexity for searching in a B-tree of order 4 and size n?在存储了n个元素的4阶B树中查找，单个节点进行一次查找的时间复杂度为：
A.
O(1)
B.
O(lgn)
C.
O(n)
D.
O(nlgn)
【判断题】高科技产品不仅对体育竞赛的成绩有影响，还会影响运动员的日常训练。
A.
正确
B.
错误
【单选题】下面说法正确的是
A.
FileWriter类是Writer类的子类
B.
FileWriter类是OutputStreamWriter类的子类
C.
FileWriter类是FileOutputStream类的子类
D.
Wirter类是OutputStreamWriter类的子类
打开"刷刷题APP"，使用更方便
打开APP