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单选题
P5-5面板上的备用电源电门设置到“AUTO”位，那么备用电源系统的供应将：
A
备用电源系统的电源供应将发生电源转换
B
备用电源系统电源供应的转换功能将失效
C
备用电源系统的转换功能将进入预位状态
D
备用电源系统将进入人工转换状态
答案解析
正确答案：C
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