A.軸箱 B.軸箱拉桿 C.牽引桿 D.旁承
A.閉鎖 B.開鎖 C.全開 D.其它
A.111 B.112 C.113 D.114
A.1:10 B.1:15 C.1:20 D.1:40
A.Ⅰ或Ⅱ B.Ⅰ C.Ⅱ D.Ⅰ和Ⅱ