How to choose gas alarm

According to the characteristics of gas sensors, the sensors used on various types of gas alarms are very sophisticated. Because of the inability to measure quantitatively, semiconductor sensors are mostly used in home alarms and spot-type alcohol detectors, w.......

Design and Analysis of Single Sealing Valve Soft Sealing Structure

1 Introduction Control valves (also known as control valves) are the ultimate control elements of the process control loop, but they are also a weaker link in the system's process control loop. Regulating valve by regulation type can be divided into regulation type, regulation cut off and c.......

How big is the battery pollution hazard?

According to experts, a button battery can pollute 600,000 liters of water; a No. 1 battery rots in the ground, which can make a square meter of land useless. Experts pointed out that if used batteries are mixed with household waste, after the batteries rot, the dissolution of heavy metals .......

Dihao EC7 Europe NCAP four-star results

Euro-NCAP (European New Vehicle Safety Evaluation Association) is the most authoritative safety testing organization in the automotive industry. It was founded in 1997 and was initiated by the governments of five European countries. It is a project that combin.......