单选题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.Athe capstanBthe collectorCthe panelsDthe surface
单选题
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
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