介绍当今国外挤压法生产重质纯碱的四种工艺流程，并对其中两类流程加以技术经济分析和评价。
This work introduces four process for dense soda ash production by extruding process currently used in China and foreign countries and the technology comparison.
因此，对最佳管理措施在控制农业非点源污染中的成本与效益进行经济分析和评价，是十分必要的。
So it is necessary to analyze and evaluate the cost and benefit of BMPs applied in agricultural non-point source pollution prevention.
通过对环境质量分析、健康效应评价和经济效益估算，初步论证了集中供热措施的环境干预作用。
Through environmental quality analysis, health effect evaluation and economic efficiency assessment, initially proved interfering effects of centralized heat suPPly measures on the environment.
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