假设每生产1吨钢要消耗1.5吨煤炭和2吨铁矿石每吨煤炭铁矿石和钢材的运费相同乙地为钢铁消费市场图7中数值表示两地距离读图回答问题 Template




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tomski假设每生产1吨钢要消耗1.5吨煤炭和2吨铁矿石每吨煤炭铁矿石和钢材的运费相同乙地为钢铁消费市场图7中数值表示两地距离读图回答问题 coloring