单选题: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(  )。

题目内容:
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

参考答案:
答案解析:

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

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