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The iron bones of rare metals
Rare element is in the nature reserves and distribution of rare and general human application of less element, is often used to make special metal materials, such as aircraft, rocket, atomic energy industry belongs to the key material.
In the rare metal family, there are many stubborn "tough people". They seem to have clenching iron, not only melting point, but also very resistant to corrosion. Even if exposed to air, it is not easy to oxidize.