bulls-eye;bullseye

Existence of Positive Periodic Solutions of a Neutral Delay Competition Model with Diffusion and Stock;

具投放的中立型时滞竞争扩散系统正周期解的存在性

It analyzes the current status and problems in water supply and wastewater treatment in Yunnan Copper and describes the application of metering pump in reagent dosing for water supply and wasterwater treatment.

分析了云南铜业股份有限公司给水和污水处理的现状及存在的问题,介绍了计量泵在药剂投放过程中的应用实践。

Research on the frictional mechanism of jam of the airplane projector;

飞机投放机构卡死问题的摩擦机理研究