during case造句

• Abstract : this paper introduced few kinds of problems or complicated conditions which were liable to occur during casing section milling operation , meanwhile , discussed basic reasons for such problems and provided corresponding methods to solve them
  文摘:介绍了套管段铣作业中易出现的几种问题或复杂情况，探讨了产生这些问题的基本原因，并提出了解决问题的相应对策与措施。