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Rare earth elements have been widely used in petroleum, chemical industry, metallurgy, textile, ceramics, glass, permanent magnet materials and other fields. Therefore, it is necessary to know and understand rare earth elements,
The APP mainly provides rare earth element oxides, aiming to help users understand and learn the name, molecular formula, relative atomic mass and other physical and chemical properties of rare earth element oxides. Users can learn rare earth oxides by doodling or drawing, which can quickly learn and remember, and also allow users to understand and learn the properties of the compounds.

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