分析了管道内腐蚀和产生沉积物的因素，以及抑制内腐蚀和沉积物的措施。
The factors causing pipe internal corrosion and precipitate are introduced and the measured against internal corrosion and precipitate discussed.
从氮氧化物的生成机理入手，通过分析生成方程序和条件，得到影响热力型氮氧化物的因素主要为温度和含氧量。
Begins with the formation mechanism of nitrogen oxides, by analyzing the equation and conditions, the main affects of nitrogen oxides 'formation is put forward, i. e. temperature and oxygen content.
二氧化硫是一种污染物，并且是形成酸雨的主要因素。
Sulphur dioxide is a pollutant and a major contributor to acid rain.
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