Usually the panels are interlocked with （） so that the devices can be made dead before the doors are opened.<br>A:protective earth<br>B:isolators<br>C:ground switch<br>D:circuit-breakers

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

出自：海船船员证

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