In the first chapter, it introduces the background of study, present situation of city public utilities and the management of water industry, the research method and content.

论文的第一章主要介绍研究背景，城市公用事业和供水行业的现状，以及研究的方法及内容。

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This paper analyzes the research literature on using the student assistant in university library in the last few years with the biblio-metric method and literature content analysis.

本文采用文献计量法和文献内容分析方法，对近几年来大学图书馆使用助教的研究文献进行了分析。

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Research shows a decline in the trace mineral content of fruits and vegetables grown in the conventional method.

研究表明，传统的水果和蔬菜种植方法会使微量元素的含量下降。

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