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metal

Metal generally refers to a special luster (that is, a strong reflection of visible light) and opaque, ductile and thermal conductivity of a class of substances. The narrow concept of metal is a simple substance composed of metal elements [4]. Pure metals are generally solid at room temperature (except mercury), most of which are excellent conductors of electricity and heat, with greater density and higher melting point. [1] The earth's metal resources are widely found in the Earth's crust and oceans. Except for a few very inactive metals such as gold and silver, which exist in elemental form,

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