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【单选题】
对称三相负载星形接于三相电源上, 正确的说法是A.
一定要有中线
B.
线电压是相电压的 倍，线电压超前相电压30°
C.
相电压是线电压的 倍，相电压超前线电压30°
D.
线电流是相电流的 倍，线电流超前相电流30°
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