单项选择题
A.1.1 B.1.05 C.1 D.0.9
A.4kV B.6kV C.8kV D.10kV
A.1.0 B.0.9 C.0，8 D.0.7
A.+10%，-10% B.+7%，-10% C.+10%，-7% D.+7%，-7%
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