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【判断题】
离心泵的缺点是不能自吸，开泵前需灌泵，不能输送粘度大的油品。A.
正确
B.
错误
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【简答题】The selection of English teachers used to be mainly based on ________.
【简答题】（本题满分16分）已知函数 （其中 为常数， ）为偶函数. (1) 求 的值； (2) 用定义证明函数 在 上是单调减函数； (3) 如果 ,求实数 的取值范围.
【简答题】Most of English learning schools hire foreign teachers from English-speaking countries such as USA, UK, Canada, etc. , but sometimes they dont know whether the person is good at teaching or not. Are n...
【单选题】English teachers can always help the students _____. [ ]
A.
with reading
B.
with Chinese
C.
at English
D.
at speaking
【简答题】已知函数 f(x)=x+ 2 x ，x≠0 （1）用定义证明函数为奇函数； （2）用定义证明函数在（0， 2 ）上单调递减，在（ 2 ，+∞ ）上单调递增； （3）求函数在[1，4]上的最大值和最小值．
【简答题】已知函数 . （1）求函数的定义域； （2）若 为奇函数，求 的值； （3）用单调性定义证明：函数 在 上为减函数.
【多选题】What are the challenges facing English language teachers?
A.
English language teachers are expected to change their views about language which is not a system of linguistic knowledge but a means for communication.
B.
English language teachers are expected to change their traditional role of a knowledge transmitter to a multi-role educator.
C.
English language teachers are expected to use more task-based activities and put the students at the center of learning.
D.
Be aware of the challenges English teachers may face under the New National English Curriculum.
E.
English language teachers are expected to use more formative assessment in addition to using tests.
F.
English language teachers are expected to use modern technology in teaching, creating more effective resources for learning and for using the language.
【简答题】已知定义域为 的函数 是奇函数． （Ⅰ）求 的值； （Ⅱ）证明函数 在 上是减函数.
【简答题】已知函数 ，请用定义证明 在 上为减函数.
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