Mineral picking - hand selection

Hand picking is an ancient method of picking dressing stone. When there are more waste stones in the ore mining, and the ore and waste rock have obvious differences in color, shape and transparency, hand selection is .......

An advanced and sophisticated engine production line is particularly important for an engine company. Maisford 's spare parts supply system has both self-produced and supporting equipment. Fixed-cycle distribution and the opening of spare parts e.......

Refrigerated trucks are of great importance for the quality assurance of food transport. Not only do many items need to be transported but also refrigerated trucks. For example, the transport of drugs also.......

We all know that the drive sy.......

Air pollution has become a serious social problem in the world. Recently, the smoggy weather in many cities has attracted more attention from the Chinese people. Inspecting the history of China, the air pollution problem has begun to appear in some big cities during the Ming and Qing Dynast.......