Video conference system development status

Videoconferencing is the use of television and telephone to hold meetings between users in two or more locations and communicate voice and image communication in real time. It can also attach still images, files, faxes, and other signals. Those who participate in the video conference can express t-----

Coal mine gas prevention and control technology

Coal mine gas disasters have many aspects of factors, but mainly boils down to natural conditions, management and technical three factors, to control gas disasters, must hand from two aspects, strengthen management and supervision, improve disaster prevention Technical and equipment level. In recent-----

Non-ferrous metal mining technology

Non-ferrous metal mining and mineral mining is divided into two main steps. Taking copper mining as an example: At present, China's copper mining is mainly two modes of open pit mining and underground mining. Open-pit mining is the separation of the rock layers overlying the ore body, and then-----