问题:
A . νA=311sin(wt-120°),νC=311sin(wt+120°)B . νA=311sinwt,νC=311sin(wt+120°)C . νA=311sin(wt+90°),νC=311sin(wt-90°)D . νA=311sin(wt+90°),νC=311sin(wt-+20°)
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