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何谓二肠合治法?

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What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure?()

A. Refrigerator
B. Refrigerant
Cooling medium
D. Brine

ARQ通信中,无以下信号.()

A. 呼叫块
B. 结束块
C. 信息块
D. CS块

元代的北方基本上萧条,南方依旧繁荣。

A. 正确
B. 错误

焊接修复法根据使用的热源不同分为()和电焊。

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