(来学网)频率为2.0MHz的超声在人体软组织中传播时的波长为
  • A.
    (来学网)0.73mm
  • B.
    (来学网)0.77mm
  • C.
    (来学网)0.76mm
  • D.
    (来学网)0.74mm
  • E.
    (来学网)0.78mm