www.bzfxw.comICS13.020CCSZ0621辽宁省地方标准DB21/T3973—2024闭坑露天煤矿综合治理技术规程Technicalspecificationforcomprehensivetreatmentofopen-pitclosedcoalmine2024-06-30发布2024-07-30实施辽宁省市场监督管理局发布www.bzfxw.comwww.bzfxw.comDB21/T3973—2024I目次前言..................................................................................II1范围.................................................
