ICRU24号报告建议,靶区剂量的总不确定度应()
A.<2.0%
B.<2.5%
C.<3.0%
D.<3.5%
E.<5.0%
参考答案:E
--- Do you speak Chinese, or Japanese?
---- I don’t speak_____ of them.
A.none
B.all
C.neither
D.either
简述布坎南公共选择理论的贡献。