Shanghai auto show into a disaster relief meeting


On April 20th, on the media day of the 2013 Shanghai International Auto Show, a light rain began to patter in Shanghai, and the air was slightly chilly. At 8:02 a.m., a 7.0-magnitude earthquake occurred in Lushan, Sichuan Province, thousands of miles away. At 9 o'clock, the press conf.......

Report: China's Tire Industry Market Concentration Analysis


First, the industry concentration is low

The degree of market concentration is usually calculated based on CR4 (ie, the market share of the top four corporate brands in the industry) or CR8. The degree of industrial concentration reflects the monopoly and compet.......

How to use paper dust tester

ZCA-1 Paper Dust Tester is manufactured according to the standard GB/T1451-1989 "Determination of paper and paperboard dustiness" and is used to determine the dustiness of paper. With reasonable structure and convenient operation, it is widely used in the test field of paper materials.......

Control valve on-site performance testing and maintenance

Control valve on-site performance testing: a lot of performance control valve, the following items should be focused on testing and calibration. 1) The basic error: the 20 ~ 100kPa signal steadily increase or decrease the input chamber (or locator), measuring the stroke value corresponding to e.......