In this study, material inputs of iron ore, crude copper and crudealuminum of China were calculated and analyzed.
本文以中国铁矿石、粗铜和原铝生产为研究对象，对其物质投入进行了计算分析。
2
While the overall material input of iron ore and crude copper displayed a decreasing trend, that of crudealuminum presented ruleless over the study period.
全国铁矿石和粗铜的物质投入在整体上有较明显的下降趋势，但原铝的这一指标则无规律可循。
3
The companies cut down more than 30% of energy consumption per unit of production of alumina, ethylene and caustic soda, and over 10% for crude-oil processing, electrolytic aluminum and cement.