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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
Enzo farah was born in the home of a small sheet metal factory in Modena, northern Italy, on February 18, 1898. Because he was born with heavy snow, he was not able to declare his name until 20 days later. His father, Alfredo, was not only a superb cast iron man, but also a drunk racing fan. At the age of 10, his father took him to see a car race in polonya. He was fascinated by the breathtaking and exciting scene of the race, and he was looking forward to becoming an excellent racer. When he was 13 years old, he tried to convince his father that he would be allowed to drive a car alone, and that he had been in a relationship with the car ever since.
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