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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
People often think that only car-racers have opportunity to own the easiest cars worldwide. However, this idea is not right in all cases because police in several countries can also be equipped some famous supercars that help them get closer crimes everywhere. Now, let\'s check out typical mirrors the most effective cop cars like Lamborghini Gallardo LP560-4, Ferrari 612 Scaglietti, Mitsubishi Lancer Evolution X, FQ-999, Caparo T1 and Brabus Rocket Police Car.
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