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【单选题】
u1 = 20 sin (314 t + 60 o )V, u2 = 5 sin (314 t + 60 o )V,两个交流电压叠加后的电压u的数学表为:( )A.
u = 16 sin (314 t + 60 o )V
B.
u = 20 sin (314 t + 60 o )V
C.
u = 25 sin (314 t + 60 o )V
D.
u = 30 sin (314 t + 60 o )V
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