Before the()of the derrick, check all the tackle closely.A、operationB、operateC、operatedD、operator

Before the()of the derrick, check all the tackle closely.

  • A、operation
  • B、operate
  • C、operated
  • D、operator

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单选题Before the()of the derrick, check all the tackle closely.AoperationBoperateCoperatedDoperator