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