Russian President says if the European Union imposes an oil embargo, Europe will buy energy at the most expensive price and economic activity in Europe will weaken. Rosneft needs to change its business model. Russia will help facilitate settlement an…
Ferric oxide is an inorganic substance with the chemical formula Fe3O4. It is a magnetic black crystal, so it is also called magnetic iron oxide. It is a commonly used magnetic material. Usually used as a pigment and polishing agent, it can also be u…
Why do we need to know the common sense of using 33215 bearing? Bearing users very much hope that the bearings installed on the main engine will not be damaged and maintain their dynamic performance during the predetermined period of use. However, th…