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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
Qualir Auto Electronics Co., LTD, founded in 1998, aims to Make car owners' drive with less effort and cosily by giving auto electronics of Quality and Reliability. In May 1998, Qualir developed and create Car CD, VCD Players and home CD,DVD Players. In March 2003, Qualir began to develop and create Car Mp3 players,Car DVD Players,and effectively developed Car DVD Players with Built-in GPS function in 2004. In June 2007, Qualir made a decision to create a platform for direct wholesale of Auto electronics. In September 2007, Qualir's wholesale Dept was successfully founded and our online wholesale store was finally completed.
A tyre is a circular, circular elastic rubber product that is rolled on various vehicles or mechanically. Usually mounted on a metal rim, it can support the body, cushion the impact, realize the contact with the road and guarantee the driving performance of the vehicle. Tyres are often used under the condition of complex and demanding, it when driving under various deformation, load, force and the function of the high and low temperature, so you must have high load-bearing performance, traction performance and buffer performance. At the same time, it is required to have high abrasion resistance and flexural flexibility, as well as low rolling resistance and heat resistance. Half of the world's rubber is used for tyre production, and the tyre is shown to use rubber.
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