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一、概述随着支柱的更新换代,中国统配煤矿总公司所属各局、矿的单体支柱工作面已基本实现了液压支柱化。目前单体液压支
I. Overview With the upgrading of the pillars, the single prop working face of the bureaus and mines owned by the China General Coal Mine Corporation has basically realized the hydraulic prop. The current single hydraulic branch