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34.管道工程中,( )的闸阀,可以不单独进行强度和严密性试验

发布于 2021-02-23 18:42:38

【单选题】
A 公称压力小于1MPa,且公称直径小于或等于600mm
B 公称压力小于1MPa,且公称直径大于或等于600mm
C 公称压力大于1MPa,且公称直径小于或等于600mm
D 公称压力大于1MPa,且公称直径大于或等于600mm

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杨子 2023-02-23

给我一个不努力成为资本家的理由？

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