单项选择题
A.Um B.Um/√3 C.1.25Um D.0.72Um
A.110kV、286kV B.102kV、266kV C.108kV、281kV D.144kV、320kV
A.15% B.25% C.35% D.45%
A.10% B.15% C.20% D.25%
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