(来学网)低频电流的频率是
  • A.
    (来学网)1000Hz以下
  • B.
    (来学网)1~100kHz
  • C.
    (来学网)100kHz~150GHz
  • D.
    (来学网)150~200GHz
  • E.
    (来学网)200~300GHz