A.5°~10° B.10°~12° C.12°~25° D.25°~30°
A.1~2 B.1/2~1 C.1/6~1/3 D.1/8~1/6
A.側(cè)澆口 B.平縫澆口 C.潛伏式澆口 D.護(hù)耳式澆口