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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
The four auto companies merged into the auto union ag in 1932. In terms of car production, the automobile alliance was the second largest automobile manufacturing company in Germany at the time, and the merchandise was marked by four connected rings, representing four automobile companies participating in the merger. For the first time in the world, there are four rings.
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