Av nplaum graphite crucibles, tseem hu ua graphite pawg lossis molten tooj liab ladles, yog cov cuab yeej tseem ceeb hauv kev lag luam hlau. Cov crucibles no feem ntau yog siv los smelting non-ferrous hlau xws li tooj liab, tooj dag, kub, nyiaj, zinc, thiab lea ...
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