A.正錐體 B.橢圓柱 C.圓柱體 D.桶狀體
A.α=1.4 B.α=1.05~1.15 C.α=0.8~0.9 D.α=0.4~0.5
A.α≥1.4 B.α=1.05~1.15 C.α=0.8~0.9 D.α<0.4~0.5