Steel industry is the pillar of the national economy and blast furnace is very important for the steel industry.
钢铁工业是国民经济的支柱产业，高炉炼铁是钢铁工业的重要组成部分。
The accurate awareness of actual pillar boundary is the basis for the blast design for pillar extraction and is also one of the effective ways to improve the mine economic benefit.
准确掌握矿柱实际边界是矿柱回采爆破设计的基础，也是提高矿山经济效益的有效途径之一。
The accurate awareness of actual pillar boundary is the basis for the blast design for pillar extraction and is also one of the effective ways to improve the mine economic benefit.
准确掌握矿柱实际边界是矿柱回采爆破设计的基础，也是提高矿山经济效益的有效途径之一。
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