单选题

The OEUs change 115v Ac from the main bus to 5v AC for row call lights and 12vAC for the reading lights.

AOEUs将主汇流条上的5V交流电转换成115V交流电以供给排呼叫灯和12v交流电的阅读灯。

BOEUs将来自主汇流条的115V交流电转换成用于排呼叫灯的5V交流电和用于阅读灯的 12v交流电。

COEUs将来自主汇流条的115V交流电转换成5V和12v的直流电，用于排呼叫灯和阅读灯。

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正确答案：A （备注：此答案有误）

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