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【单选题】
已知 u 1 =60sin(314t+90°)V ， u 2 =80sin(314t)V ，则 u 1 + u 2 = （ ）。A.
u 1 + u 2 =140sin(314t)V
B.
u 1 + u 2 =100sin(314t)V
C.
u 1 + u 2 =100sin(314t+36.9°)V
D.
u 1 + u 2 =140sin(314t-36.9°)V
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