正弦交流电流i=10√2sin(100πt+30°)A,则频率为(____)。
A100Hz$;$100πHz$;$50$;$50Hz
B100Hz$;$100πHz$;$50$;$50Hz
C100Hz$;$100πHz$;$50$;$50Hz
D100Hz$;$100πHz$;$50$;$50Hz
A100Hz$;$100πHz$;$50$;$50Hz
B100Hz$;$100πHz$;$50$;$50Hz
C100Hz$;$100πHz$;$50$;$50Hz
D100Hz$;$100πHz$;$50$;$50Hz