单项选择题
A.1.5% B.1.0% C.0.5% D.0.3%
A.0.5m B.1.2m C.2.2m D.3.6m
A.0.15m B.0.25m C.0.35m D.0.45m
A.铆接 B.法兰 C.螺纹 D.承插
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