单项选择题
A.0.8MVA B.0.63MVA C.0.5MVA D.0.4MVA
A.0.866倍 B.1倍 C.1.15倍 D.0.707倍
A.±0.1% B.±0.2% C.±0.5% D.±1.0%
A.67% B.50% C.30% D.20%
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