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Mining Engineering Mine Supports And Strata Control Difficulty: Medium

For testing a specimen in laboratory length's diameter ratio should be

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Which of the following refrigerant is used in u/g air conditioning plant. Room and pillar mining confined to almost . . . . . . . seams. The unit of illumination is S. I unit. Empty, cylinder capacity of BG 174 is . . . . . . . . litters. When the water perculation of strata only this is required