单项选择题
城市燃气输配管道的压力等级中,中压燃气管道压力为()。
A.0.8,0.4
B.0.2,0.005
C.P≤0.005(MPa)
D.0.005,0.45
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单项选择题
A.0.8,0.4
B.0.2,0.005
C.P≤0.005(MPa)
D.0.005,0.45
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