(单选题)10: 相量U=100∠30° ,频率为50 Hz,它代表的正弦波是( )
A: u(t)=141sin(314t-30°)
B: u(t)=141sin(314t+30°)
C: u(t)=100sin(314t+30°)
D: u(t)=100sin(314t-30°)
(责任编辑:admin)要这答案加QQ:800020900 或加微信:vq800020900 获取