Introduction is given to selection of technological pro cess and main equipment in zinc casting plant in case of change of product structure and comparison between several types of the furnace.
文章介绍了工厂在产品结构发生变化的情况下，锌冶炼熔铸车间工艺流程的选择，主要冶炼设备的选型，并对几种炉型进行比较。
The correct understanding of landscape plant introduction and bio-invasion has an important significance to China's urban landscape construction.
正确地认识园林植物引种工作和生物入侵，对我国城市的园林建设，具有重要的现实意义。
The application of natural dyes in China is illustrated in brief, and introduction to the progress of the applied study of plant dyestuff in the dyeing and health care is given.
文章简要地回顾了天然染料的应用，并介绍了植物染料在染色及保健方面的应用进展。
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