A.2.0~2.5 B.0.9~1.9 C.0.6~0.8 D.0.3~0.5
A.大于1.5° B.大于3° C.小于1.5° D.小于3°
A.大于2.5% B.大于1.5% C.小于2.5% D.小于1.5%