背杆曲连杆机构
quadratic crank mechanism
调速器拉杆曲柄
governor linkage bellcrank
对称连杆曲线
symmetrical connecting-rod
curve of symmetric connecting rod
活塞连杆曲轴系统
Piston-connecting rod-crankshaft assembly
空肠曲杆菌
Campylobacter fetus jejuni
连杆曲面
curved surface of the link
连杆曲线图谱
link curve atlas
link line pattern
connecting rod curves collective drawing