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Also known as the sleeper plate circuit. It is a prestressed concrete sleeper plate, which is laid in a compacted bed, and the wires are filled with asphalt or other materials. The prestressed concrete sleeper plate is 55cm wide and twice as wide as the normal prestressed concrete sleeper, with the same length and thickness as the ordinary prestressed concrete sleeper (see color map). Therefore, the contact area between the wide sleeper and the daoist bed doubles the contact area between the normal sleeper and the daoist bed, thus reducing the pressure on the bed
BMW's history began in 1916 and translated into bayer in China's early years. The company was originally an aircraft engine manufacturer, and in 1917 it was a limited liability company, and in 1918 it changed its name to the Bavarian engine manufacturing company and went public. Jingqiu names "- otto high achievements in the field of aviation, made him with great ambitions to build cars, he later this decision, for the automotive history writing down a glorious page, that is by millions of fans love the German BMW depot today.
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