A.a(22,-10)c(-57,86) B.a(-22,10)c(57,-86) C.a(-22,10)c(-57,86) D.a(22,-10)c(57,-86)
A.順銑 B.逆銑 C.二者皆可 D.以上皆非
A.10~11齒 B.7~8齒 C.3~4齒 D.1~2齒