(来学网)6MeV电子柬穿射5%所需LML的厚度是
  • A.
    (来学网)0.5cm
  • B.
    (来学网)1.0mm
  • C.
    (来学网)1.5mm
  • D.
    (来学网)2.0mm
  • E.
    (来学网)3.0mm