(来学网)可发生界面发射时,两种不同材料的声阻抗是
  • A.
    (来学网)0.05
  • B.
    (来学网)0.01
  • C.
    (来学网)0.005
  • D.
    (来学网)0.001
  • E.
    (来学网)0.0005