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【单选题】
单向阀作背压阀用一般单向阀A.
允许流量较大
B.
压力损失较小
C.
开启压力较大
D.
动态压力超调量小
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举一反三
【简答题】婴儿生理性流涎发生的原因是（）。
【简答题】简述基坑支护结构的主要类型。
【单选题】I wrote ______ passage in English class yesterday. [ ]
A.
an eight-hundred-word
B.
an eight-hundred words
C.
a eight-hundred-words
D.
a eight-hundred words
【单选题】听力原文：W: The concert starts at eight thirty. What time is it now? M: About ten to eight. We must hurry up. What time is it now?
A.
7:50.
B.
8:10.
C.
8:30.
【单选题】听力原文：M：It's already ten past eight. What time does the play start? W：At eight exactly, according to the newspaper, but of course they seldom start on time. Q：What does the woman imply? (14)
A.
The play is seldom delayed to start.
B.
The play will start twenty minutes later.
C.
The newspaper is seldom wrong.
D.
They probably have to continue to wait.
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