Face— The exposed area of a coal bed from which coal is being extracted. Face cleat — The principal cleavage plane or joint at right angles to the stratifiion of the coal seam. Face conveyor — Any conveyor used parallel to a working face which delivers coal into another conveyor or into a car. Factor of safety — The ratio of the ultimate breaking .
A 암페어. Abbe's Principle 아베의 원리. aberration 수차. ablation 융제. ablator 애블레이터. ABM 탄도탄 요격 미사일. abnormal explosion 이상 폭발
System safely inverts and empties drums of various dry materials into your process. The MTS hydraulic Lift Seal System™ seals drum to a dusttight pour cone for a clean working environment.
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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 of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back abutment, .
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