单选题 1分

switchboards may be of the dead-front type in which all live parts are installed behind后面 ____ and o...

switchboards may be of the dead-front type in which all live parts are installed behind后面 ____ and only the operation handles and instruments are on the front.
  • A.the collector
  • B.the surface
  • C.the capstan
  • D.the panels

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