三相四线直供电线路,已知作星形联接的三相负载中U相为纯电阻,V相位纯电感,W相为纯电容,通过三相负载的电流均为10安培,则中线电流为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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