Which of the following is applicable to the coal plough()

A.The quality of coal is medium hard or above. It does not stick to the roof and can contain large hard dirt B.The floor is flat, and there is no requirement for the hardness of coal seam C.There are large faults and folds along the strike and dip direction of coal seam D.The thickness of coal seam is less than 2m and the dip angle is small

时间:2024-02-07 16:50:25

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