Substances conveying plant resistance to insects include inorganics, primary and intermediary metabolites and secondary substances.

给予植物抗虫性的物质包括无机物，初始、中间代谢物和次生物质。

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Conposition, characteristics and operation of a dense phase pneumatic conveying system with positive pressure for coal ash in Thermal Power Plant of Anqing Petrochemical Work are described.

详细介绍了安庆石化热电厂正压浓相气力输灰系统的组成、点及运行情况。

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This article introduces reformed plant of PTA conveying, analyzes characteristics of plant reform and conducts cheek and discussion of its process design.

介绍了改造后的PTA输送装置，分析了装置改造的特点，并对其工艺设计进行了核算和讨论。

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