The paper reaches a conclusion that industrial evolution is in nature a change of the combination of production factors, where technical factor plays a leading role in both supply and demand aspects.
通过本文的研究可以得出这样的结论：产业演化实质是要素组合的变动，技术要素在要素组合中起着主导性作用，技术进步通过供给、需求两方面主导产业演化。
The new top cyclone of Humboldt was synthetically studied in cold model conditions in combination with the parameters of industrial production line.
本文通过冷态模型试验，结合实际生产参数的测定，对JY厂洪堡型顶部旋风预热器进行了系统研究。
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