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4.在回采和准备工作中应用新技术,把工作面搬迁到用金属支柱的掌子,改变顶扳管理方法。由于与所列举的每个因素之计划的差别而引起的整个矿井工人数的相对变化ч_4,按下式确定:
4. Apply new technology in the production and preparation of the work, move the work surface to the metal pillar brace, change the top-pull management method. The relative change in the number of miners as a result of the difference from the plan for each of the factors listed ч_4 is determined as follows: