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floor of coal seam
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floor of coal seam
Encyclopedia
理学
煤炭地质勘查
释
floor of coal seam
煤层底板
在正常顺序的含煤岩系剖面中,直接伏于煤层下面的岩石。
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existence criterion
existence domain
existence factors
existence form of element
existence limit of nucleus
existence of best approximation
existence of lift
existence of required elements of crime
existence precedes essence
existence principle
existence problem
existence proof
existence property
existence region
existence symbol
existence theorem
existence theorem for roots
existential
existential closure
existential condition
existential formula
existential generalization
existential illumination
existentialism
existentialism methodology of psychology
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