A.50sin(wt - 90°)A B.2sin(wt+120°)A C.50sin(wt+90°)A D.2sin(wt - 120°)A

题目

A.50sin(wt - 90°)A
B.2sin(wt+120°)A
C.50sin(wt+90°)A
D.2sin(wt - 120°)A
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