Kev haus luam yeeb

Hauv kev ua luam yeeb ceev ceev, kev tu cev thiab kev txiav zoo ib yam yog qhov tseem ceeb. Peb cov riam-tiv taus thiab ultra-ntse carbide xa cov slitting meej thaum siv cov ntaub ntawv abrasive rau kev lag luam txhim khu kev qha.