Analysis the character of hydrodynamic calculation for natural circulation of industrial boiler and give the recommendation of calculation method for simple and complex circulation circuit.
分析工业锅炉自然循环的水动力计算特点，对简单及复杂循环回路的计算方法提出建议。
2
The strategies include: science and technology leading strategy, circulation economic strategy, replace industrial strategy, resources reserve strategy and comparative advantage strategy.
这些战略内容包括：科技主导战略、循环经济战略、接替产业战略、资源储备战略和比较优势战略。
3
The layout for city industrial enterprise needs to consider fully the transportation characteristic in area, first the characteristic of city wind field (includes the influence of local circulation).