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单选题
1278. The standby AC bus gets power from the left transfer bus, but changes to the static inverter when these are all true: left transfer bus does not have power; battery switch is on; standby power switch is in AUTO ( )
A
备用交流汇流条从左转换汇流条获得电源,但当如下情况发生任一条件时,变换到静变流机:左转换汇流条没有 电:电瓶电门接通;备用电源电门在自动位。
B
备用交流汇流条从左转换汇流条获得电源,但当如下情况都发生时,变换到静变流机:左转换汇流条没有电:电 瓶电门接通;应急电源电门在自动位。
C
备用交流汇流条从左转换汇流条获得电源,但当如下情况都发生时,变换到静变流机:左转换汇流条没有电:电瓶电门接通;备用电源电门在自动位。
答案解析
正确答案：C
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