Analyzes operation mode of neutral point in plant power supply system and working characteristics of single-phase grounding, from the viewpoint of increasing power supply reliability and decreasing system insulating level, puts forward the fit situation of all kinds of operation modes.

A detailed engage in speech about the apply ?count the heating power?structural desing?working characteristics and applied result in 4T industry boiler of the carbon steel-water thermal tuble air transducer.

Then each sub-responding-time and functional cycle were studied and analyzed, which led to the summarization of the operational characteristics.

In order to improve the competitive ability and management level of domestic engineering construction companies in international BOT project bidding,this paper,based on international BOT project bidding practice,introduces and analyses comprehensively the international BOT projects with respect to the concept of BOT project,operational characteristics,financing ways,risk factors and so on.

Introduction and analysis of working features of PLC high-speed counter;