A.0.2 B.0.5 C.1.5 D.2.5
A.5∶3∶1 B.15∶5∶3 C.1∶3∶5 D.3∶5∶15
A.三個相電壓的相量和必為零 B.三個線電壓的相量和必為零 C.三個線電流的相量和必為零 D.個相電流的相量和必為零