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kuang ye dong tai
Pages: 55-
58
Year: 2009
Issue:
6
Journal: Nonferrous Mines
Abstract: 我国矿产资源开发利用取得新进展目前全国已建成国有矿山企业8 840个,集体与个体矿山企业26万个,从事矿业的人员总数近200万人,已开发利用的矿产资源达139种。我国矿产资源
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