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【单选题】
下述支持该诊断的是
A.
周期短,正常
B.
周期正常,延长
C.
腹痛
D.
月经不规则
E.
闭经3个月
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【单选题】水工隧洞的回填灌浆的目的是( )。
A.
加固围岩,提高围岩的整体性
B.
保证围岩的弹性抗力
C.
充填衬砌与围岩之间的空隙
D.
减小外水压力
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【单选题】How is an artificial fog made in the movies?
A.
By passing steam over dry ice.
B.
By turning ordinary ice into steam.
C.
By melting dry ice.
D.
By mixing dry ice with ordinary ice.
【单选题】By the time my mom _____ to our school, all others of my class ______ for home.
A.
got, left
B.
got, had left
C.
had got, had left
D.
had got, left
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A.
To show how the steam engine contributed to refrigeration
B.
To illustrate the standard of living of North America and Europe
C.
To give an example of an innovation that expanded markets
D.
To argue that refrigeration was the most important invention of the time
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【单选题】If a boiler is isolated from the steam-using system, how must it be kept?
A.
ln closed dry storage.
B.
Completely full of treated water.
C.
Under a low steam pressure
D.
Any of the above
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【判断题】元杂剧最早盛行在燕京。()
A.
正确
B.
错误
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