(来学网)当两种不同材料的声阻抗相差多少时,就会产生界面发射
  • A.
    (来学网)0.1%
  • B.
    (来学网)0.01%
  • C.
    (来学网)0.02%
  • D.
    (来学网)0.05%
  • E.
    (来学网)1%