A.15 B.5 C.10 D.20
A.10 B.11 C.12 D.15
A.高于 B.低于 C.相等 D.不能确定
A.1.5 B.2.5 C.3.5 D.4.5
A.小于52% B.等于52% C.大于52% D.不确定