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【简答题】
下图为鞍山市部分工业企业分布图。回答1—2题。
1、20世纪50年代鞍山已成为我国重要的钢铁工业基地，其形成的主要区位优势是 [ ] A．高科技力量雄厚B．水陆交通便利C．水资源丰富D．矿产资源丰富 2、图中各企业高度集聚的最主要原因是 [ ] A．存在投入—产出联系B．共用原料和基础设施C．共用劳动力D．集中治理工业污染
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