短语词组短语cam m follower 凸轮随动件Cam -Follower Mates 凸轮推杆配合cam mechanism follower 凸轮机构从动件cam and follower 凸轮挺柱cam -follower mechanism 凸轮从动杆机构plate cam -follower mechanisms 平面凸轮机构 返回 cam follower