Scrap consists of materials, usually metals, left over from product manufacturing and consumption, such as parts of vehicles, building supplies, and surplus materials. Unlike , scrap can have , especially recovered , and non-metallic materials are also recovered for recycling. Once collected, the materials are sorted into types – typically metal scrap will. [pdf]
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To reduce the gas disaster of high gas coal seam and improve the efficiency of gas extraction by high drilling, the layout parameters of drilling holes in Pingdingshan coal mine are optimized. Based o. [pdf]
Xiong'an New Area is a in the area of , China. Established in April 2017, the area is located about 100 kilometers (62 mi) south of and 50 kilometers (31 mi) east of downtown . Its main function is to serve as a development hub for the Beijing-Tianjin-Hebei () economic triangle. Additionally, nonessential functions of the Chinese capital. [pdf]
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