单项选择题
A.24%B.34%C.44%D.54%
A.21%B.31%C.41%D.51%
A.10%B.12%C.14%D.16%
A.10%B.15%C.18%D.21%
A.17%B.19%C.21%D.23%
A.5%B.6%C.7%D.8%
A.可以B.不可以
A.17.6%B.19.6%C.21.6%D.23.6%
A.24.5%B.28.5%C.32.5%D.36.5%
A.21%B.22%C.23%D.24%