下列4个命题 ①若f(x)在x=a处连续，且|f(x)|在x=a处可导，则f(x)

发布时间：2018-04-05 20:39 │ 来源：www.tikuol.com

题型：单项选择题

问题：

下列4个命题
①若f(x)在x=a处连续，且|f(x)|在x=a处可导，则f(x)在x=a处必可导．
②设φ(x)在x=a的某邻域内有定义，且

存在，则f(x)=(x-a)φ(x)在x=a处必可导．
③设φ(x)在x=a的某邻域内有定义，且

存在，则f(x)=|(x-a)|φ(x)在x=a处可导．
④若f(x)在x=a的某邻域内有定义，且

存在，则f(x)在x=a处必可导．
正确的命题为

考点：普通考研考研数学(二)考研数学二

题型：单项选择题

These days computer games have bcome more and more popular in many cities and towns. A lot of small shops along busy ___1___ have changed into computer game houses in order to get more ___2__. These places are always crowded with people
In the computer game houses, people __3__ a lot of money matching on the machine. It’s __4__ for one to beat a computer, but one can do well after trying again and again. People want to __5__ when they play computer games. The more they __6__, the more they want to win, and at last they even can’t __7__ without it.
The result is that some people don’t want to _8_ and they play in computer game houses for hours and hours. For school boys, things are __9__. They don’t want to have __10__. When school is over, they rush to the computer houses near their __11__. Some of them can get enough money from their ___12__. Some of them are not _13__ to get the money. So they have to steal or rob others’ and become __14_ . Computer game addiction(上瘾) is a __15_ problem in our life. Something has to be done to stop it.

D．interesting

查看答案

题型：单项选择题

The boy is _____. Today is his _____ birthday.[ ]

A. twelfth; twelfth

B. twelve; twelfth

C. twelfth; twelve

D. twelve; twelve

查看答案

题型：单项选择题

网上竞价发行中发行规模较小的股票，其比较难以被大资金操纵发行的价格。( )

查看答案

题型：单项选择题

月经量增多、经期延长是浆膜下肌瘤突出的表现。

查看答案

题型：单项选择题

中国传统社会是一个君主专制的社会。下列各项中，不是君主自称的一项是（）

A、余一人

B、寡人

C、朕

D、吾

查看答案

更多题库