The type, source and harm of pollutants of urban non-point source pollution and its influence on the receiving water are analyzed.
对城市面源污染物的种类、来源和危害，以及对受纳水体的影响两方面综合进行分析；
By investigation and inspection, the analysis and evaluation were made for the source and harm of the combustible gas, so the tunnel construction was guaranteed.
通过调查、检测对可燃气的来源、危害性等进行了分析评价，保证了隧道施工。
This paper starts from source and harm of harmonics, continues with the principle and structure of APF, and a comparison of several harmonic detection and control methods.
本文从谐波的危害和产生入手，先介绍了有源滤波器的原理及结构，然后对有源滤波器的谐波检测和控制方法做出分析比较。
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