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The lamp's material is iron and aluminum... More
The lamp's material is... More
Its rush pith are temperature preserval, surface uses color steel plate. And the connection are made of color steel plate. The joint is air... More
Vacuum switches have the advantages which air and oil switches can not compared with. Since 1990s, the vacuum switches have been widely used in power system, post & telecommunication system, mines and electric-railways.Ceramic tube is the key element of... More
Post-tensioned unbounded prestressed concrete bar is suitable for cast-in-place concrete of long-span and wide buildings, large load prefabricated beam and other construction. It has the characters of not need room for future expansion and grouting... More
