试题详情

正弦交流电流i=10sin(100πt+30°)A,则初相角为(____)。

A0°$;$30°$;$60°$;$90°

B0°$;$30°$;$60°$;$90°

C0°$;$30°$;$60°$;$90°

D0°$;$30°$;$60°$;$90°