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Coal mine – An area of land and all structures, facilities, machinery, tools, equipment, shafts, slopes, tunnels, excavations, and other property, real or personal, placed upon, under, or above the surface of such land by any person, used in extracting coal from its natural deposits in the earth by any means or method, and the work of ...
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Copper in the USA: Bright Future Glorious Past ... but they were able to extract copper only from highgrade ores. The development of efficient flotation processes ¹ around the turn of the century opened up the exploitation in Arizona, Montana, and Utah of large porphyry ore deposits in which the copperbearing minerals are widely dispersed ...
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Download Citation on ResearchGate | Online load operating mode of oil film bearing in high speed wire rolling mill | To study the mechanism of burnt damage of oil film bearing in highspeed wire ...
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In deep mining of coal mine, ... In the investigation of the dynamic characteristics of rock or coal materials under high loading rate [16 ... the coal sample still possesses certain bearing capacity that enables it to be compacted together with the rock sample and continues to bear the dynamic load until the rock sample also breaks up, then ...
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In multihigh mills, the slim fixed floating work rolls are supported by primary and secondary intermediate rolls and several supporting rolls mounted pairswise on supporting shafts. ... "Hybrid Calculations of Bending Deformations for 20 Roll Cold Rolling Mill", Key Engineering Materials, Vol. 716, pp. 856863, 2016. 上线时间: October ...
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