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Saj zawg zog graphite daim ntawv ntau yam thiab kev pabcuam zoo
Graphite ntawv yog ib qho tseem ceeb muaj raw khoom. Raws li nws txoj haujlwm, cov cuab yeej thiab siv, ntawv muab faib ua ke, cov ntawv sau graphite, graphite daim ntawv ntim, graphite lub tog graphite ntim, graphite lub dab dej, thiab lwm yam.