pushing-pulling air-cushion platform 推拉式气垫平台

pushing-pulling 推拉

Pushing pulling mechanism 推拉机构

frequency pushing and frequency pulling 频率推挽

pushing and pulling forces 推挽力

pushing and pulling screw jack 螺旋推拉起重器

pushing and pulling 推扳手法

pulling and pushing manipulations 推拉手法

this pushing and pulling 这种来来回回的