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【单选题】
（）离心泵发生汽蚀后很容易断流。A.
低比转数
B.
中比转数
C.
转数
D.
A和B
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举一反三
【简答题】— Bill, if it doesn’t rain, we can go straight on and spend more time in Vienna.—__________ I just want to hear Mozart. A．Well done! B．No problem C．That’s great! D．That’s it.
【单选题】Let's not wait any longer, he might not（）at all.
A.
turn over
B.
turn up
C.
turn on
D.
turn down
【单选题】——Let’s go skating after school. ——_____ Call for me at any time.
A.
Wait a moment.
B.
Sounds good.
C.
That depends.
D.
What for?
【单选题】Let’s not wait any longer, he might not ________ at all.
A.
turn over
B.
turn up
C.
used to
D.
turn down
【简答题】Always make sure you protect your skin against the sun because whenever you ________ your skin to the sun, you are increasing your chance of skin cancer.A. bindB. exposeC. insertD. shelter
【简答题】Make sure you insert the disk ______________into the drive.
【简答题】Let's not wait any longer, he might not ____ at all.
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