A.2cm2cm B.1cm2cm C.2cm1cm D.1cm1cm E.2cm1.5cm
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