久久精品国产99久久久,天天躁日日躁狠狠躁AV中文,亚洲精品美女久久久久99,国产高级会所按摩妓女在线

Bearing is an important part of contemporary machinery. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its accuracy.The inspection items in operation include the rolling sound,

The power industry can be divided into thermal power generation, hydropower generation, wind power generation, nuclear power, and bio-power generation.Power equipment is roughly divided into: generator sets, pumps, valves, power load transfer devices, imp

An important difference between a car and an ordinary mechanical bearing is that the car bearing is used in a moving environment, and the environment of each part of the car varies greatly, so the force condition and working condition of the car bearing a

The places where mining machinery and engineering machinery are active are mostly mining sites away from ordinary human life, such as mountains and deserts, and sometimes even work underground 2,000 meters. These types of machinery range from mineral grin

There are many kinds of metallurgical equipment, not only the equipment required by the raw material plant, but also the equipment required from the upstream process to the downstream process, such as the steel making process, the rolling process, and the

Railway industry In the field of rail transportation, motor vehicles are vehicles used to provide power. A motor car can be a tractor unit for a locomotive or an EMU. Autorail Grande Capacit (AGC) FAG Wheelset and Drive Bearings in AGC 2007 Bo