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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
Second thing to set up system is how often you modify the river inside tank. When you frequently change the water inside the tank, the arowana fish is distressed with the change of water temperature as well as the irregular amounts of acidity of the lake. You need equipment that may help you to only change the river inside the tank only once or twice a week. That?s once the filter system enters the scene. Make sure that the filtration system are fully operational, otherwise it'll pollute water and poison the fish. I suggest you install both a and internal filter for better water circulation.
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