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【单选题】
三相电接法分为星形接法和三角型接法，下列说法正确的是（ ）。
A.
当相电压为220V时，星形接法的电源端线电压也为220V
B.
当相电压为220V时，三角形接法的电源端线电压也为220V
C.
电动机软启动时，电动机先是三角形接法，后是星形接法
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