A.越强 B.越弱
A.C10~C20 B.C15~C24 C.C18~C40 D.C30~C45
A.1 B.1.5 C.1.25
A.0~2B.1~2C.2~3D.2~4
A.mz B.m(Z+2) C.m(Z-2) D.m(Z-2.5)