Drop tube for head- and cross Drop tube 是落管的意思?for head- and cross span是顶梁和十字梁吗通过上下文看好像是一些建筑词汇pull 作为名次？Attachment for pull off

Drop tube for head- and cross Drop tube 是落管的意思?for head- and cross span是顶梁和十字梁吗通过上下文看好像是一些建筑词汇pull 作为名次？Attachment for pull off 什么是drop-tube? leave the tube for one exhausted tube and flair tube for GLS是什么意思? tube tube Tube head to和head for head for是什么意思啊? head for的同义词 英语翻译Push some cotton wool down the tube.Leave the tube for one week. head toward 和 head for的区别 Leave the tube for one weak. 怎么翻译 Drop drop drop l head for the company? head for the path 是什么意思