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2013-05-23 12:21
求翻译：Conceptually,a softer coal seam is sandwiched detween the relatively stronger roof and floor rocks, which are loaded by the weight of the overburden.Stress is uniformiy distrbuted in the coal seam under such conditions.When coal is extracted in slices as it is in the longwall mining,the roof over the gob area thus crwa是什么意思？ 待解决
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Conceptually,a softer coal seam is sandwiched detween the relatively stronger roof and floor rocks, which are loaded by the weight of the overburden.Stress is uniformiy distrbuted in the coal seam under such conditions.When coal is extracted in slices as it is in the longwall mining,the roof over the gob area thus crwa
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