假设每生产1t钢要消耗15t煤炭和15t铁矿石下图中甲乙两地和乙丙两地相距都为10km甲丙两地相距8km每吨煤炭铁矿石和钢材 Template




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tomski假设每生产1t钢要消耗15t煤炭和15t铁矿石下图中甲乙两地和乙丙两地相距都为10km甲丙两地相距8km每吨煤炭铁矿石和钢材 coloring