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When sampling the material in the pile of space, with each pile, whisked the material body into a pile on the flat surface of a size not smaller than 50 cm x 50 cm and dig into the crater enough volume for a brief vưông the material according to the regulations into a pit;-When taking the class materials scattered nails, to dig into the pit straight stands and intentionally full of materials according to the thickness of the layer structure.
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