(来学网)高频离心铸造机的工作频率是
  • A.
    (来学网)1.0~1.8MHz
  • B.
    (来学网)1.1~1.9MHz
  • C.
    (来学网)1.2~2.0MHz
  • D.
    (来学网)1.3~2.1MHz
  • E.
    (来学网)1.4~2.2MHz