单选题

The system design makes sure that two AC power sources can not supply power to the same transfer bus at the same time.

A系统设计确保两个交流电源不能依次供应动力给同样的转接汇流条。

B系统设计确保两个交流电源不能先后供应动力给同样的转接汇流条。

C系统设计确保两个交流电源不能同时供应动力给同样的转换汇流条。

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正确答案：A （备注：此答案有误）

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