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【单选题】
$\lim_{x\to 5} \, \frac{x-2}{x-8}$
A.
$-1$
B.
0
C.
$1$
D.
$5$
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三
教师设计提问语时,要遵循( )原则
A.
目的明确
B.
考虑幼儿认知水平
C.
难易适中
D.
从整体出发
教师设计总结语要遵循( )原则
A.
简明扼要
B.
画龙点睛
C.
概括到位
D.
生动有趣
教师的评价语有( )特点。
A.
灵活多样
B.
随机应变
C.
注重创新
D.
诙谐幽默
有如下程序 #include main() { int i,f=1,s=0; for(i=1; i<100;i++) { s=s+f*i; f=-f; } printf("s=%d\n",s); } 程序的功能是
A.
计算 1-2+3-4+...+99 的值
B.
计算 1*2*3*4*...*99 的值
C.
计算 1-3+5-7+...-99 的值
D.
计算 1*3*5*7*...*99 的值
下列火灾不可以用水直接扑灭的有( )。
A.
汽油
B.
木炭
C.
森林火灾
D.
草原火灾
关于易燃、易爆、危险物品,下列说法错误的是( )。(2.0)
A.
危害大、破坏力强
B.
易造成环境污染及大量人员伤亡
C.
由于危害大,所以严禁个人使用
D.
储存、运输及使用时,需要防止静电
按照建筑机构分类,下列错误的是( )。(2.0)
A.
钢结构建筑
B.
混凝土结构建筑
C.
高层建筑
D.
砖木结构建筑
下列关于城市消防站布局原则说法错误的是( )。
A.
消防站责任区域面积一般为4-7平方公里。
B.
统一规划、分期实施
C.
市区越密集越好,郊区加强预防即可
D.
消防站布置首要原则是消防队接警后,5分钟内到达责任区域
我国消防机构不具体履行消防监督检查职责的是( )。
A.
公安部消防局
B.
地方公安派出所
C.
县市级公安消防机构
D.
乡镇派出所
下列哪种情况不可能导致消费者消费两种产品的角落均衡?(所谓角落均衡,就是指消费者实现效用最大化时,在两种商品中全部选择其中一种商品,另外一种购买量为0)()
A.
线性的无差异曲线
B.
凸向原点的无差异曲线
C.
边际替代率递增的无差异曲线
D.
消费者的财力不支持购买第一个单位的某种产品
消防监督检查执法行为属于( )。
A.
行政执法行为
B.
刑事执法行为
C.
民事执法行为
D.
单位执法行为
下列论述错误的是()
A.
垄断厂商一级价格歧视是对每个产品都收取最高的价格
B.
二级价格歧视下垄断厂商占有全部消费者剩余
C.
价格歧视三种类型中三级价格歧视现实实施困难最大
D.
三级价格歧视实施时要求市场做到有效分割
E.
一级价格歧视条件下垄断厂商利润最大
该零件主视图的选择遵循了什么原则?
A.
加工位置
B.
形状特征
C.
工作位置
D.
倾斜零件放正
下列哪类人群对食源性疾病相对不特别敏感?( )
A.
幼儿
B.
青年
C.
老人
D.
孕妇或哺乳期妇女
以毒肽和毒伞肽为主要毒素的毒蘑菇中毒类型为( )
A.
胃肠炎型中毒
B.
神经精神类型中毒
C.
中毒性肝损害型
D.
中毒性溶血型
下列哪种霉菌毒素一般不存在于谷类食品?( )
A.
玉米赤霉烯酮
B.
展青霉素
C.
黄曲霉毒素
D.
伏马菌素
在真菌毒素中,( )是人类原发性肝癌的元凶之一。
A.
黄曲霉毒素
B.
青霉酸
C.
棒曲霉素
D.
赭曲霉素
下列四种市场结构中,竞争性最弱的是( )
A.
完全竞争
B.
垄断
C.
寡头
D.
垄断竞争
下列关于正常利润论述错误的一项是( )
A.
当企业经济利润为0时,正常利润等于会计利润
B.
正常利润是企业家从事风险活动的报酬
C.
正常利润是确保一个企业留在某行业的基本条件
D.
从机会成本的角度说,正常利润是厂商生产成本的一部分,以隐成本计入成本。
下列关于决定市场竞争程度的因素分析,错误的是( )
A.
卖者和买者的数目越多,集中程度越低,竞争程度就越高
B.
各厂商提供的产品愈是相似,可预料竞争就愈激烈
C.
单个厂商若能较好的控制价格,表明市场竞争愈激烈
D.
厂商进入或退出一个行业的越容易,竞争就越激烈
在任何市场结构中,厂商的平均收益曲线都可以由( )表示出来?
A.
厂商的需求曲线
B.
厂商的供给曲线
C.
行业的需求曲线
D.
行业的供给曲线
因组胺引起中毒的鱼为( )。
A.
金枪鱼
B.
家卿鱼
C.
草鱼
D.
鲨鱼
发芽马铃薯的致毒成分为( )。
A.
毒肽
B.
秋水仙碱
C.
茄碱
D.
巢菜碱甙
砷引起的慢性中毒,可使皮肤病变,会造成( )。
A.
痛痛病
B.
水俣病
C.
香港黑脚病
D.
克山病
相关题目:
【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
【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】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
【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】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】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
【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
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