敷设于桥梁上的燃气管道应采用加厚的无缝钢管或焊接钢管,尽量减少焊缝,对
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A.50%
A.50%
B.60%
B.60%
C.80%
C.80%
D.100%
D.100%
参考答案:
A.50%
A.50%
B.60%
B.60%
C.80%
C.80%
D.100%
D.100%
参考答案: