step rail

中国非开挖工程技术网 ... step method 逐步法 ，阶段法 step rail 斜切轨条 step resistance type wave guage 阶段抵抗波浪计 ...

http://www.pts... ... "附加贮气筒, 附加风缸"," Supplementary air reservoir" "附台阶钢轨"," Step rail" "附件"," Accessory" ...

直角三角形_馆档网 ... "阶段活塞"," step piston" "阶段轨条"," step rail" "分段螺丝攻"," step tap" ...