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September 14, Huaibei Mining Mine Safety Supervision Bureau for the stone, "three violations" organizes classes.
9月14日，淮北矿业安监局为石台矿“三违”人员举办学习班。
youdao
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September 14, Huaibei Mining Mine Safety Supervision Bureau for the stone, "three violations" organizes classes.
9月14日，淮北矿业安监局为石台矿“三违”人员举办学习班。
youdao