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【单选题】
的大小反映了带传动的传动能力, V带传动一般要求 ( )。A.
α ≤ 120°
B.
α ≤ 1 5 0°
C.
α ≥120°
D.
α ≥1 5 0°
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【简答题】The selection of English teachers used to be mainly based on ________.
【单选题】“Unfortunately, many Americans live on the outskirts of hope—some because of their poverty, some because of their color, and all too many because of both” is an example of __________.
A.
parallelism
B.
antithesis
C.
personification
D.
ogy
【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.
【单选题】These ______ are our English teachers.
A.
woman teacher
B.
man teacher
C.
man teachers
D.
women teachers
【简答题】Last year, three hundred English teachers took part in the _______ English Training此题出自2015年河北孝感中考英语真题及答案,河北孝感2015年中考试题英语问卷 Last year, three hundred English teachers took part in the _______ English T...
【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】听下面一段对话，回答第1、2小题。 ( )1. A. Because he eats some vegetables. B. Because he often takes exercise. C. Because he often goes to work on foot. ( )2. A. Three times a day. B. Three times a year. C. ...
【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 ，请用定义证明 在 上为减函数.
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