A . A.vA=311sin(ωt-120°),vC=311sin(ωt+120°)B . B.vA=311sinωt,vC=311sin(ωt+120°)C . C.vA=311sin(ωt+90°),vC=311sin(ωt-90°)D . D.vA=311sin(ωt+90°),vC=311sin(ωt+210°)
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