A.車式拉緊,重錘拉緊 B.螺旋拉緊,車式拉緊 C.車式拉緊,螺旋拉緊
A.跑偏開(kāi)關(guān) B.拉繩開(kāi)關(guān) C.防撕裂裝置
A.順時(shí)針,逆時(shí)針 B.逆時(shí)針,順時(shí)針 C.順時(shí)針,順時(shí)針