单选题Usually the panels are interlocked with （） so that the devices can be made dead before the doors are opened.Aprotective earthBisolatorsCground switchDcircuit-breakers
单选题
Usually the panels are interlocked with （） so that the devices can be made dead before the doors are opened.
A
protective earth
B
isolators
C
ground switch
D
circuit-breakers
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