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chemical industry
china
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coal gangue
commerce
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crude oil
development
drilling
energy
engineering
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frame
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iron ore
machinery
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定額
LUANNAN COUNTY - OCTOBER 13: Drilling derrick in MaCheng iron mine, on october 13, 2014, Luannan County, Hebei Province, Chinaの素材 [FY31038484848]
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