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【判断题】
离心泵按扬程大小可分为：低压泵、中压泵、高压泵、超高压泵。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】— How is everything going? — It couldn’t be _______, for I lost my wallet this morning.
A.
worse
B.
bad
C.
good
D.
better
【单选题】- Doctor, how are the twins going? - Don't worry. _______of them needs_______.
A.
Neither; to be operated
B.
Either; being operated
C.
None; to be operated on
D.
Neither; operating on
【单选题】--- ______________? --- I don’t have enough money to buy that nice skirt.
A.
How’s it going?
B.
How are you?
C.
What’s it like?
D.
What’s the problem?
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