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Onza troy
unidade de masa / From Wikipedia, the free encyclopedia
A onza troy (símbolo ozt) é unha unidade de medida de masa, tradicionalmente utilizada nos países anglosaxóns para os metais preciosos, como o ouro e a prata, e para as pedras preciosas. Unha onza troy equivale exactamente a 31,1034768 gramos.[1][2]
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