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【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
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
以下属于熔融碳酸盐燃料电池特点的是
A.
工作温度较高，反应速率加快
B.
对燃料的纯度要求相对较低，可以对燃料进行电池内重整
C.
不需贵金属催化剂，成本较低
D.
采用液体电解质，较易操作
以下属于质子交换膜燃料电池的特点的是
A.
使用固体电解质膜，能够有效避免腐蚀问题和电解液泄漏
B.
工作温度低，可在-30°C环境下启动，启动速度快
C.
其组成简单、结构紧凑
D.
工作噪音低，寿命长
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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
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tall and slim, with each node having potentially many children瘦高，每个节点可有多于两个孩子
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A.
Alex, Abbas, Alice and Ruohui.
B.
Alex, Abbas, Jiehan and Billy.
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Alex, Abbas, Alice and Saba.
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Alex, Abbas, Jiehan and Huanrui.
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reduce the number of I/O operations 减少I/O次数
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reduce the time consumption for a single I/O 减少每次I/O的时间
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reduce the asymptotic time complexity for seaching 降低查找的渐进时间复杂度
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reduce the storage requirement 节省存储空间
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A.
plagiarism, paraphrasing and summarizing
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plagiarism, paraphrasing and synthesizing
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how to avoid plagiarism, paraphrase and summarize
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$\infty$
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A.
a hour 1小时
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a day 1天
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a month 1月
D.
a year 1年
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$0$
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$1$
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$\frac{1}{2}$
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$2$
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$\frac{1}{3}$
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$1$
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不存在
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1
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-1
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不存在
【单选题】$\lim_{x\to -\infty } \, \frac{e^x-e^{-x}}{e^x+e^{-x}}$
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1
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-1
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0
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$+\infty$
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A.
减轻医疗负担
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增强抵抗力
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减少疾病
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促进心理健康
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缓解精神压力
【单选题】Through the group discussion between ______ , we figured out the differences between adolescence and adulthood.
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Abbas, Zuowan and Jialin
B.
Billy, Xuanhui and Jialin
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Abbas, Xuanhui and Jialin
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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.
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Kamlesh
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Jason
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John
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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)
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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
【单选题】How many children are there for each node in a B-tree of order 4?4阶B树中每个节点的分支数为：
A.
1~4
B.
2~5
C.
2~4
D.
3~5
【单选题】During the conversation between Billy, Yuege and Yunpeng, we took a brief look at ______ .
A.
brain development
B.
brain degradation
C.
human evolution
D.
human degeneration
【判断题】舰载机飞行活动组织流程分三个区域：飞行甲板部分、机库部分、空中部分。
A.
正确
B.
错误
【单选题】口袋中有5个球，编号为1,2,3,4,5。从中任取3个，以X表示取出的3个球的最大号码。则P(X=4)=()
A.
1/10
B.
3/10
C.
5/10
D.
7/10
【判断题】时尚总是从较低阶层向较高阶层传递。
A.
正确
B.
错误
【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
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