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nature : also known as the cover paper or writing paper. Brightly-colored appearance, and considerable sexual Light. Paper -- of a solid, wear, burst, water resistance, A, B, C 3 rating. A senior grades for the cover used, B, C is for general publications cover. High book Pizhi chemical wood pulp and other raw materials -- of the general part is doped with grasses such as pulp and paper materials, copy made after pressure from light.
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