- Model NO.: UPD .......
After the Yushu earthquake in Qinghai, Shangchai Company established the earthquake relief and disaster relief service support headquarters in an enterprise spirit that promotes harmony and caring for the society, and provided the service guarantee for the Shangchai .......
The vibration response of the disk to the cavity excitation is used to analyze the interaction between the solid parts of the medium D, that is, the vibration response of the disk to the sound field excitation in the cavity. A 3 mm thick steel disc was placed at one end of the cylinder.......
First, the status and role of coal mine screeners
1. The position coal mine security inspector is directly led by the first responsible person at all levels of safety and is the law enforcer of the security inspection agency. The inspectors.......