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【单选题】
下列设备中尤其适用于输送腐蚀性和爆炸性气体的是( )。A.
离心泵
B.
回转叶片式真空泵
C.
往复式真空泵
D.
水环式真空泵
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【单选题】______ well in an interview made him lose the position in that company.
A.
Not doing
B.
Not to have done
C.
Having not done
D.
Doing not
【简答题】阅读下面的短文，然后按照要求写一篇150词左右的英语短文。 Many students fail to perform well in an exam not because they lack ability, but because of the unique pressure of the exam room—the tense atmosphere, the ticking clock o...
【多选题】一物体做变速直线运动,某时刻速度大小为 v 1 =8 m/s,1 s后的速度大小变为 v 2 =10 m/s,在这1 s内物体的加速度大小
A.
可能小于2 m/s 2
B.
可能等于2 m/s 2
C.
可能等于18 m/s 2
D.
可能大于18 m/s 2
【简答题】听短文，选择正确答案。 1. If you want to do well in an exam, you must . [ ] A. work hard every day in the year B. study hard a few days before the exam C. get up early a few days before the exam 2. It is to ...
【单选题】From the first paragraph we can know that______.
A.
the author did very well in an aptitude test and because of this he got a promotion
B.
although the author did very well in an aptitude test his job remained unchanged
C.
a lot of people flattered the author and suggested that his job be changed as he did so well in an aptitude test
D.
the author had grudge against his superior for he did not receive a lift in his position
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