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单选题

Before you do this procedure, engage the ramp service door safety connector pin.

A Insert the pin of the apron service door security connector, then you can perform this procedure.

B The ramp service door safety pin should be engaged until you start this procedure.

C Firstly you should perform this procedure then you can engage the ramp service door safety connector pin.

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正确答案：A （备注：此答案有误）

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