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중국이 각종 희토류와 주요 광물을 무기화하면서 서방세계와 힘겨루기를 하고 있는데 엄청난 매장량이 확인된 한국의
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엄청난 매장량과 높은 순도를 보유한 한국의 텅스텐이 세계 텅스텐시장의 새로운 강자로...
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내부에는 보통 텅스텐 카바이드로 만들어진 작은 볼 베어링이 들어 있는데, 이 베어링은 ...
youtube
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