常见例句双语例句This paper made a comprehensive analysis of the reasons for non-normal failure of breaking head, collet and pull bar of PTM and further brought up the solution to it.主要分析了电解多功能天车打壳机构中打击头、 夹套、拉杆非正常失效的原因，并提出了解决的方案。 返回 pull up bar