单项选择题
A.电压有效值相等 B.频率相等 C.相位相同 D.A和B和C
A.电流/库仑 B.电流/安培 C.电荷/库仑 D.电荷/安培
A.关闭通风口 B.向舱内示警 C.抢救出贵重物品 D.开大通风口
A.1%/5% B.5%/10% C.10%/15% D.15%/20%
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