选择题:在三项电路里,下列三种结论中,正确的是()A、当负载做星形连接时,必定有中线B、凡负载作三角形连接时

题目内容:
在三项电路里,下列三种结论中,正确的是()
A、
当负载做星形连接时,必定有中线
B、
凡负载作三角形连接时,其线电流必定是相电流的√可倍
C、
三相四线制星形连接下,电源线电压必定等于负载相电压的万倍。
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