胃癌单纯放疗的剂量是( )
A:20~30Gy/2~3周
B:30~40Gy/3~4周
C:40~45Gy/4~4.5周
D:45~52Gy/5~5.5周
E:45~50Gy/3~4周
出自:肿瘤学高级职称