单项选择题
A.55% B.57.5% C.60% D.62.5% E.65%
A.500 B.450 C.600 D.550 E.以上结论均不正确
A.180 g,320 g B.185 g,315 g C.190 g,310 g D.195 g,305 g E.200 g,300 g