Knowledge

The dowty retarder was first invented by the British George Dowty, and is a hydraulic device used to control vehicle speed in the marshalling station hump speed regulation system. Divided into two par

In order to further enhance the legal awareness and legal concept of cadres and staff, earnestly improve the ability and level of administering enterprises according to law, and effectively prevent bu

In order to better improve the understanding of e-commerce employees on mechanical products, improve sales skills, and improve sales performance, on the morning of August 3, Jining City, Jining City M

At present, mine-type mine electric locomotives are indispensable tools for mining in mines. As you may know, mine-type mine electric locomotives are made from wires by means of “pantograph”. The circ

LED has low photoelectric conversion efficiency, most of the electricity is maily converted into heat energy. With the wide application of LED ming lamps, people put higer demands on the power. if the

In order to improve the legal quality and legal affairs ability of the Group's management staffs and better safeguard the interests of the Group. On the afternoon of August 5, Shandong China Coal Grou