多项选择题
A.机械锁扣 B.无锁扣 C.用钩棒机构 D.用操作机构
A.1%~1.2% B.1%~1.3% C.1%~1.5% D.1%~1.6%
A.10~25 B.20~45 C.30~45 D.40~55