In order to resolve this problem, a detail study was carried out on using steel spirally fluted tubes replacing copper plain tubes without lowering the previous performance of heat transfer.
针对该问题，开展了用钢质螺旋槽管替代原有铜光滑管并使其达到原有换热性能的研究。
At first, the article introduces the existing catalogues, procedure and status of passenger transfer services in order to find out the problems in this phase.
本文首先介绍了东航现有的客运中转服务，通过对其种类、操作流程及现状的分析，挖掘出当前中转业务中普遍存在的问题。
The thesis aims to investigate the nature of language transfer in the process of SLA in order to find out an effective way to facilitate L2 learning and improve the quality of L2 teaching.
本文主要探讨二语习得过程中语言迁移现象的本质，从而找出一条能促进二语学习，提高二语教学质量的有效途径。
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