According to work practice of copper raw materials inspection and the research, analyze, summarize on unmoral raw material in recent years.

根据铜原料检验的工作实践，对近几年来进厂的异常原料进行研究、分析、总结。

youdao

BHP Billiton Ltd., the world’s largest mining company, led a retreat among raw-material companies, sinking 2.2 percent, as the price of copper headed for its largest decline in two weeks.

由于铜金属价格创下2周来最大跌幅，欧洲股市原材料板块下跌2.2%，全球最大的矿业企业必和必拓公司跌幅居前。

youdao

Shaped into pellets convenient for shipping, copper and tin ingots were the raw material for making the metal which defines the Bronze Age.

铜和锡锭是制作金属的原材料，它们被磨成小球型可以便于运输，而那个时代也因金属而得名。

youdao