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。
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.
介绍了即将实施的欧盟化学品新法规出台背景和主要内容，并浅析了新法规对我国石油化工行业的影响。
This paper introduces the background and main contents of new EU chemical regulation that will put into practice soon, and discusses its influence on the petrochemical industry in China.
本文重点介绍目前电梯行业的节能背景，简单描述台达IED一体化系统的节能技术以及应用案例。
This article introduces current energy-saving background of elevator industry, simple description of the Delta IED Integrated System of energy-saving technology and application case.
应用推荐