A.电流 B.电压 C.电动势 D.电流、电压、电动势的统称
A.17.32 B.10 C.30 D.15
A.80% B.60% C.20%
A.8%—10% B.5%—10% C.10%—15% D.3%—5%
A.2.5 B.3.5 C.6 D.10
