考试
1970-01-01 08:00:00

(单选题) 公称直径在65mm-200mm之间的金属密封阀门

题目描述

(单选题) 公称直径在65mm-200mm之间的金属密封阀门严密性试验和强度试验的时间分别是()

A20s,10s

B30s,20s

C30s,40s

D30s,60s

答案解析

D

D

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