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The concrete (usually with steel bar) is poured directly into the stable and solid roadbed, and the new line of ordinary sleeper and gravel bed is not used. This kind of line is clean, suitable for large volume and difficult maintenance area, especially for tunnel, underground railway, port wharf and stone road base. But its construction investment is big, if because of the construction slapdash or basement instability, concrete layer fracture, cure difficulty. China's overall Taoist route in the tunnel is more than 300 kilometers long
BMW company was founded in March 7, 1916, BMW's predecessor is a plane factory, the original is famous for manufacturing streamline the wings of a spy plane, the predecessor company name is BFW, company founder "- Otto (Gustan Otto). On July 20, 1917, BFW companies began to restructure, formally known as BMW, "BMW" formal Chinese character called the Bavarian engine manufacturer co., LTD. (German: BayerischeMotorenWerke AG), is a world famous luxury car brand, headquartered in Munich, Bavaria. BMW is often called the Bimmer, and the brand is often called BMW in mainland China, Hong Kong and early Taiwan.
To restore the original driving block method;
Audi, a German company that makes cars and motorcycles, dates back to the 19th century. Initially located in Saxony four car companies - zwickau city (zwickau) audi (audi) and horch (horch) motors, chemnitz - sigma city (chemnitz - siegmar) rover auto company (wanderer) and DKW zschopau city car companies, for the progress of the German car industry has made outstanding contributions.
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