Substances conveyingplant 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。
2
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。
3
This article introduces reformed plant of PTA conveying, analyzes characteristics of plant reform and conducts cheek and discussion of its process design.