A.細(xì)刮 B.粗刮 C.手刮 D.挺刮
A.1/4~1/2 B.1/3~1/2 C.1/6~1/3 D.1/8~1/4
A.2/3~3/4 B.1/2~3/4 C.1/3~1/2 D.1/5~1/2