| 单词 | columbite-tantalite |
| 例句 | The minerals are gold, cassiterite, wolframite and columbite-tantalite, also called coltan. S.E.C. Votes to Require More Disclosure on Source of Minerals 2012-08-22T16:53:07Z How the SEC is monitoring electronics companies use of cassiterite, columbite-tantalite and wolframite. Disruptions: Wearing Your Computer on Your Sleeve 2011-12-19T03:13:41Z The minerals in question—cassiterite, columbite-tantalite, gold and wolframite—are widely used in consumer electronics and other products, although Congo supplies no more than 20% of global demand for these raw materials. Can Annual Reports Save Lives? 2011-12-16T23:14:58Z It is also an important source of columbite-tantalite, the mineral known as coltan that is used in mobile phones and computers. Congo’s Kabila Set to Extend 10-Year Rule Amid Fears of Violence 2011-12-07T07:49:35Z Financial regulators working on the overhaul of Wall Street rules ventured into foreign territory Tuesday, probing the depths of human suffering in war-torn central Africa and the chemical derivatives of minerals such as columbite-tantalite. SEC struggles to write ?conflict minerals? regulations for companies 2011-10-19T00:21:28Z |
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