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【单选题】
已知两正弦量u1=220sin( 314t+30°)V,u2=311sin( 314t-60° )V则( )。A.
u1比u2超前30°
B.
u1比u2滞后30°
C.
u1比u2超前90°
D.
不能判断相位差
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