A.普通鉸手 B.丁字形鉸手 C.固定式鉸手 D.板牙鉸手
A.0.1~0.2 B.0.01~0.02 C.0.2~0.3 D.0.02~0.03
A.1%~3% B.2%~4% C.3%~5% D.4%~6%