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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
The Red Baron, whose real name was Manfred Albrecht Freiherr von Richthofen, was the most famous German flying ace of World War I. He had a really short flying career, which spanned just over 50 % of World War I, and died with the age of 25 in April 1918 after being shot down over Morlancourt Ridge, at the Somme. He was officially credited with 80 air combat victories, though further report on data indicates that the number may have been better 100. As for Red Baron airplanes, all were Fokkers, or Albatroses, plus one Halberstadt D.II.
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