【单选题】
A 关闭1UPS逆变器→断开1UPS输出开关Q5N→断开1 UPS旁路开关Q4S→断开1UPS电
B 关闭1UPS逆变器→断开1UPS主电源开关Q1→断开1UPS旁路开关Q4S→断开1UPS电池开关QF1→断开1UPS输出开关Q5N
C 断开1UPS输出开关Q5N→断开1UPS旁路开关Q4S→断开1UPS电池开关QF1→关闭1UPS逆变器→断开1UPS主电源开关Q1
D 断开1UPS旁路开关Q4S→断开1UPS电池开关QF1→关闭1UPS逆变器→断开1UPS主电源开关Q1→断开1UPS输出开关Q5N
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