PDF(1669 KB)
PDF(1669 KB)
PDF(1669 KB)
兴泰煤矿二1煤层坚硬顶煤预裂爆破技术
({{custom_author.role_cn}}), {{javascript:window.custom_author_cn_index++;}}Presplit Blasting Technology for Hard Top Coal of Xingtai Coal Mine Second 1 Coal Seam
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