單項(xiàng)選擇題安全監(jiān)控系統(tǒng)中在機(jī)房或調(diào)度室的設(shè)備,相對(duì)濕度環(huán)境()

A.40%~60%
B.40%~70%
C.50%~60%
D.50%~70%


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