正弦交流电压有效值为220v,频率为50Hz,t=0时,u(0)=220V,则该正弦电压表达式为
A.u=220sin(314t+45°)V
B.u=311sin(50t+135°)V
C.u=31lsin(314t-45°)V
D.u=311sin(314t+45°)V
正确答案是D
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