题目内容：
燃气管道双管同沟埋设时，两管间应控制的净距是（）cm。A．20
B．30
C．50
参考答案：
单选：燃气管道双管同沟埋设时，两管间应控制的净距是（）cm。A．20B．30C．50
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- 题目类型：单选
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A．20
B．30
C．50
A．20
B．30
C．50
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