1.Gold foil Txoj kev loj hlob ntawm cov ntawv ci kub ntawv ci yog ib daim ntawv nyias hammered tawm ntawm kub.Vim nws zoo heev ductility thiab plasticity, ib los yog ob (31.25 grams) ntawm cov kub ntshiab yuav hammered rau hauv kub ntawv nyiaj ntawm 1/10,000th ntawm ib. millimeter tuab thiab 16.2 square metres hauv cheeb tsam.Qhov ntawd yog, ib gram ntawm kub tuaj yeem b ...
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