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Which of the followings is not an indication of a bad maintenance？ _____________.

2020-09-18 20:40:06 资格考试 阅读

问题详情

A.a pipe with welded connections

B.a pipe with several clips

C.a cement box

D.a leaking valve

请帮忙给出正确答案和分析，谢谢！

参考答案

考点：