Switchboards may be of the dead-front type in which all live parts are installed behind （） and only the operation handles and instruments are on the front.<br>A:the capstan<br>B:the collector<br>C:the panels<br>D:the surface

Switchboards may be of the dead-front type in which all live parts are installed behind （） and only the operation handles and instruments are on the front.
A:the capstan
B:the collector
C:the panels
D:the surface

出自：海船船员证

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