稀土有何作用?主要用在哪些领域?
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![稀土有何作用?主要用在哪些领域?](/uploads/image/z/4638562-34-2.jpg?t=%E7%A8%80%E5%9C%9F%E6%9C%89%E4%BD%95%E4%BD%9C%E7%94%A8%3F%E4%B8%BB%E8%A6%81%E7%94%A8%E5%9C%A8%E5%93%AA%E4%BA%9B%E9%A2%86%E5%9F%9F%3F)
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