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【单选题】
$\lim_{x\to -\infty } \, \frac{e^x-e^{-x}}{e^x+e^{-x}}$
A.
1
B.
-1
C.
0
D.
$+\infty$
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三
通客车出厂车要求钩体、钩舌及钩尾框不裂保证期为( )
A.
一个段修周期
B.
一个辅修期
C.
一个厂修期
D.
2年
检修周期中.车辆运行公里数达( )万km,可以进行A5修
A.
(240±12)
B.
(240±24)
C.
(480±24)
D.
(480±48)
检修周期中.新造后首次A2修走行周期允许为( )万km。
A.
(60±2)
B.
(60±6)
C.
(60±10)
D.
(60±12)
检修周期中.车辆运行公里数达( )万km,可以进行A2修
A.
(20±6)
B.
(40±12)
C.
(60±6)
D.
(32±12)
检修周期中.车辆运行公里数达( )万km,可以进行A3修
A.
(120±6)
B.
(120±12)
C.
(120±24)
D.
(120±48)
检修周期中.车辆运行公里数达( )万km,可以进行A4修
A.
(240±12)
B.
(240±24)
C.
(240±20)
D.
(240±60)
国徽标记应按( )有关规定制造。
A.
国际联运
B.
国家标准
C.
城际联运
D.
国际快运
国徽属于()
A.
共同标记
B.
配属标记
C.
特殊标记
D.
通用标记
制造厂铭牌安装在车体二位或三位( )上。
A.
端墙上部
B.
侧墙中部
C.
脚蹬
D.
横梁中部
手制动机都安装在( )。
A.
第一位
B.
第二位
C.
第三位
D.
第四位
此标记表示该车辆可以用于国际联运( )。
A.
圆圈内绘有“MC”标志
B.
圆圈内绘有汉字“超”标志
C.
圆圈内绘有汉字“关”标志
D.
圆圈内绘有汉字“卷”标志
我国铁路规定,在客货车辆上以( )为第一位,另一端为第二位。
A.
客列尾安装方位
B.
制动缸活塞杆推出的方向
C.
防滑器传感器安装的方位
D.
运行方向的前端
此标记表示该车辆具有车窗,必要时可输送人员( )。
A.
圆圈内绘有“MC”标志
B.
圆圈内绘有汉字“人”标志
C.
圆圈内绘有汉字“关”标志
D.
圆圈内绘有汉字“”标志
此标记表示某部分结构超出车辆限界的货车( )。
A.
圆圈内绘有“MC”标志
B.
圆圈内绘有汉字“超”标志
C.
圆圈内绘有汉字“关”标志
D.
圆圈内绘有汉字“卷”标志
此标记表示表示运输特殊货物的车辆( )。
A.
圆圈内绘有“MC”标志
B.
圆圈内绘有汉字“超”标志
C.
圆圈内绘有汉字“特”标志
D.
圆圈内绘有汉字“”标志
此标记表示侧梁端部装有卷扬机挂钩的货车( )。
A.
圆圈内绘有“MC”标志
B.
圆圈内绘有汉字“超”标志
C.
圆圈内绘有汉字“关”标志
D.
圆圈内绘有汉字“卷”标志
此标记表示活动墙板及其他活动部分翻下超过车辆限界的货车( )。
A.
圆圈内绘有“MC”标志
B.
圆圈内绘有汉字“超”标志
C.
圆圈内绘有汉字“关”标志
D.
圆圈内绘有汉字“卷”标志
车辆如有几个制动缸,则装有( )的一端为1位端。
A.
手制动机
B.
电源控制柜
C.
乘务室
D.
紧急制动阀
车辆的方位是以( )活塞杆伸出的方向来决定的。其伸出方向为一位车端,另一端为二位车端。
A.
客列尾安装方位
B.
制动缸活塞杆推出的方向
C.
防滑器传感器安装的方位
D.
运行方向的前端
货车中按标签定位方式较标签较近的一端为()
A.
一位端
B.
二位端
C.
名义一位端
D.
名义二位端
相关题目:
【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】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
【单选题】What's the return value for a failed search in a B-tree of order 4?B树查找算法若最终失败,返回值为:
A.
None
B.
NULL
C.
A pointer to the last examined node 指向最后一个所查找节点的指针
D.
A pointer to the root 指向根节点的指针
【单选题】Which of the following is NOT the reason why she does not like to take photos with the camera?
A.
It was easy to break
B.
It was too heavy
C.
it is easy to get stolen
D.
it is too expensive
【单选题】What “eat earth” means?
A.
Having to spend less after spending a lot during the shopping festival.
B.
Living a luxurious life after earning a lot of money.
C.
Having failed to live a modest life.
D.
Living a luxurious life.
【单选题】Popular novels can be adapted and made into ____; ____ and _____.
A.
films; television programs; video games
B.
cartoons; dramas; games
C.
websites; televisions; audio programs
D.
films; cartoons; games
【单选题】下面说法中错误的是
A.
FileReader类是Reader类的间接子类
B.
InputStreamReader类是Reader类的子类
C.
BufferedReader类可以读取一行
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\}$
【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 ) $
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