A.0.4~2Gy/h B.1~3Gy/h C.2~8Gy/h D.8~12Gy/h E.≥12Gy/h
A.10% B.15% C.20% D.25% E.30%
A.2cm2cm B.1cm2cm C.2cm1cm D.1cm1cm E.2cm1.5cm