单项选择题
A.6/2/3 B.6/3/6 C.6/2/6 D.12/2/3
A.5%/10% B.10%/15% C.15%/20% D.20%/20%
A.备用机组自动运转 B.应急照明供电 C.辅机按顺序起动 D.选择切断和备用机组自动运转