论文利用二次正交回归的设计方法对无氟保护渣的成分与熔点的关系进行了研究。
In this paper, the relationship between component and melting point of fluorine free mould fluxes was studied by means of regressive orthogonal design.
城市生活垃圾成分复杂，并且焚烧过程中会产生重金属的二次污染，是城市垃圾处理中最难解决的问题。
Because of the complex composition in MSW, secondary pollution of heavy metals in the process of MSW incineration is the most difficult problem to be solved in MSW disposal.
好氧生物处理会产生大量的、成分复杂的剩余污泥，如果处置不当容易造成二次污染。
In aerobic wastewater treatment system, large amount of complicated ingredient sludge are formed. If not being disposed properly, the sludge can cause secondary pollution to environment.
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