China Petroleum Refinery Catalyst System is in its infancy

18 kinds of catalysts support the development of refining and chemical business The reporter learned from the SASAC yesterday that the major scientific and technological special projects for the development and industrial application of CNPC's refining catalysts have been launched since 201.......

An introduction to the correct use and maintenance of megohmmeters

Abstract : The megohmmeter is commonly known as the shaking table. It is a portable instrument designed to detect the insulation resistance of electrical equipment and power supply lines. The quality of electrical equipment insulation is related to the normal operation of electrical equipment a.......

Introduction to compaction method of small walking roller

It is advisable to use small vibratory roller or 35~50t tire roller for compaction of highway and primary road subgrade. When rolling with a vibratory roller, the first pass should not vibrate static pressure, then slow down and then fast, from weak vibration to strong vibration.

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