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前言在毛主席革命路线的指引下,随着喷锚支护在我局的广泛应用,为改善作业条件,减轻劳动强度,在中南矿冶学院、西安机具研
Foreword Under the guidance of Chairman Mao’s revolutionary line, with the wide application of shotcrete and bolt support in our bureau, in order to improve working conditions and reduce labor intensity,