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【单选题】
$\lim_{n\to \infty } \, e^{-n}$A.
0
B.
1
C.
-1
D.
$\infty$
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
关于焊条的选择依据,下列说法错误的是（ ）。
A.
在不影响焊接质量的前提下,为了提高劳动生产率,一般倾向于选择较大直径的焊条
B.
厚度较大的焊件,应选用较小直径的焊条
C.
在使用性能基本相同时，应尽量选用价格较低的焊条，降低焊接成本
D.
焊条直径的选择主要取决于焊件厚度、接头型式、焊缝位置及焊接层次等因素
在裂解汽油加氢精制过程中，温度是加氢反应的主要影响因素，加氢是（ ），对反应有利，但反应速率较慢。
A.
放热反应，升高反应温度
B.
吸热反应，升高反应温度
C.
放热反应，降低反应温度
D.
吸热反应，降低反应温度
半实物仿真工厂中，苯乙烯精制工段，即采用了水冷又采用的盐冷物料有哪些？（ ）。
A.
苯/甲苯回收塔塔顶物料
B.
粗苯乙烯塔塔顶物料
C.
精苯乙烯塔塔顶物料
D.
乙苯回收塔塔顶物料
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A.
a hour 1小时
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a month 1月
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【单选题】During the conversation between Billy, Yuege and Yunpeng, we took a brief look at ______ .
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【单选题】What's the height of a B-tree of order 128 relative to a corresponding BBST?若B树的阶m=128，则它的高度大致是对应的BBST的：
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It was easy to break
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It was too heavy
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it is easy to get stolen
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it is too expensive
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【单选题】Popular novels can be adapted and made into ____; ____ and _____.
A.
films; television programs; video games
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BufferedReader的readLine()函数，如果没有数据时会返回0
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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
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【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.
$\frac{1}{3\sqrt{y}}$
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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.
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x-arcsinx+c
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a great daily exercise
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a great way to keep your lawn beautiful
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a great way to keep you healthy
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landscape painting
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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】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.
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B.
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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
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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
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150
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200
【多选题】儒家“六艺”中，( )和（ ）接近于今天的体育？
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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
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