This paper briefly introduces the fundamental principle of network planning technology and discusses its application in the project management of chemical equipment production.
初步介绍了网络计划技术的基本原理，并探讨了其在化工设备制作工程项目管理中的应用。
Procedure rules and fundamental principle of surface colouring of Cu and Cu alloy are investigated. Chemical reactive mechanism of surface colouring of Cu and Cu alloy is probed also.
研究铜及其合金的表面着色过程的规律和基本原理，对铜及其合金表面着色的化学反应机理也进行了相应的探讨。
The fundamental principle and technical method of LIDAR system for remotely detecting chemical warfare agents are related.
介绍了化学毒剂激光遥测报警系统的基本原理与技术方法。
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