单项选择题
A.2cm;2cm B.1cm;2cm C.2cm;1cm D.1cm;1cm E.2cm;1.5cm
A.4~15MeV B.10~25MeV C.10~20MeV D.4~25MeV E.4~20MeV
A.5mm~10cm B.5mm~20cm C.5mm~5cm D.5m~15cm E.5~10mm