The present situation of their research and application in wastewater treatment at home and abroad are summarized, and their further researches are discussed.
本文综述了近年来国内外声、光、电、磁技术在水处理中的研究及其应用概况，并对其深入研究进行了展望。
Basic concepts and category classification of environmental hazards are reviewed according to the analysis on their present research situation home and abroad.
通过对国内外环境灾害研究现状的分析，综述了环境灾害的基本概念和类型划分。
The paper introduces the CNC routing technology and its typical application products-CNC router as well as present situation and trend of the application research on CNC router at home and abroad.
介绍了数控镂铣技术的典型应用产品——数控镂铣机，以及数控镂铣机在国内、外应用现状及发展趋势。
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