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With this computer system against abrasion and the hardness is set up top. Therefore, the material must have the ability to heat levelhigh external hard to resist abrasion, but at the same time must have ductility inside in order to avoid breaks in the course of work. The handles by Islam must work continuously and axial bearing in the process should work for the priority property of a material's hardness against abrasion, flexibility in the core to avoid breaking during working
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