Qhov ntom ntom yog ib qho ntawm cov khoom siv lub cev tseem ceeb tshaj plaws ntawm cov ntaub ntawv.Qhov ceev yog qhov loj ntawm ib chav tsev ntim ntawm cov khoom, sawv cev los ntawm lub cim p, thiab nws chav tsev yog g / cm.Thaum cov qib ntawm cemented carbide paub, los ntawm kev ntsuas nws qhov ntom, peb tuaj yeem tshuaj xyuas seb qhov muaj pes tsawg leeg thiab cov qauv ntawm ...
Nyeem ntxiv