地下燃气管道与构筑物的水平间距无法满足安全距离时,应(  )。

地下燃气管道与构筑物的水平间距无法满足安全距离时,应(  )。A.将管道设于管道沟或刚性套管内 B.采用管桥 C.埋高绝缘装置 D.采用加厚的无缝钢管

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热力管道严密性试验一级管网稳压(  )min内压力降不大于0.05MPa;二级管网稳压30min内压力降不大于(  )M

热力管道严密性试验一级管网稳压(  )min内压力降不大于0.05MPa;二级管网稳压30min内压力降不大于(  )MPa为合格。A.60;0.03 B.45

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The little girl _____ her cup a moment ago, but luckily it

The little girl _____ her cup a moment ago, but luckily it wasn’t broken.A.drop

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His parents wanted to know what he _____ at that time.

His parents wanted to know what he _____ at that time.A.is doing B.was doing C

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Hi, Mr. Smith. I didn’t know you were in New York. How long

Hi, Mr. Smith. I didn’t know you were in New York. How long ____ here?A.have yo

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