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analysis of problems associted with grinding machines
Glossary of Mining Terms - Coal Education
A. Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch ...
Mental disorders - Universidade Federal do Rio Grande …
Epidemiology: a national survey of US citizens has found that 6% of them have a debilitating mental illness. More startling, almost 50% of those surveyed were found ...
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