单选题:燃气管道穿越高速公路时,在重要地段的套管或地沟端部宜安装(  )。

题目内容:
燃气管道穿越高速公路时,在重要地段的套管或地沟端部宜安装(  )。 A.放散管
B.排污管
C.排气管
D.检漏管

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答案解析:

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