当管道或设备中压力持续上升达到限定的最高压力时，安全阀阀瓣全

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问题单项选择题

当管道或设备中压力持续上升达到限定的最高压力时，安全阀阀瓣全开，排泄额定的排量，这时阀门进口处的压力称（）压力。

（A）开启

（B）排放

（C）关闭

（D）工作

答案

参考答案：B

听力题

词汇（10分）

小题1:I hope you and your classmates will enjoy ________(you) during your trip.

小题2:Not everyone is as ___________(humour) as Mike.

小题3:-----Are you better today?-----No, I am even _______(ill) now.

小题4:Li Fang is the _________(shy) of all the girls in her class.

小题5:Let’s go and ________(cheerful) for your school volleyball team.

小题6:After a long time and much effort, the climbers ____________(final) reached the top.

小题7:Look! Those_________(swim) are trying to swim across the lake.

小题8:For Linda, __________(keep) fit is not easy because she is very lazy.

小题9:Jim is always willing_______(help) his classmates with their problems

小题10:________ (luck), the climbers helped him to come down from the hill.

单项选择题

2015年，我国服务业在国内生产总值中的比重上升到（）。

A.30%

B.40.5%

C.50.5

D.60