接着阐述了CO_2焊接的特点、目前国内外的研究现状。

The important specialties of CO2 welding machine and its study evolution are follow set forth.

youdao

第二部分对信息构建的研究背景、定义、核心、特点及目前国内外的研究现状做了简单的概述。

Part Two presents an outline of IA's research background, definition, focus, features and research condition at home and abroad.

youdao

引言提到了目前国内外该题目的研究现状，并就本文的资料收集和研究方法做了简单介绍。

This part also mentions the status quo of domestic and foreign studies of this topic, and also defines the materials and researching methods used in this article.

youdao