cov ntsiab lus
Peb yog ib qho ntawm cov kws tshaj lij thauj tog rau nkoj cov khoom tsim khoom hauv Suav teb. Peb lub tuam txhab tuaj yeem muab cov khoom siv mining, xws li PDC thauj tog rau nkoj, carbide thauj tog rau nkoj, sab hauv hexagon ru bolt khoom thiab lwm yam.
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Qhov no yog peb R xov carbide thauj tog rau nkoj khoom, cov neeg siv khoom txaus siab rau peb qhov zoo, yog tias koj xav tau lawv, txais tos hu rau peb dawb los ntawm Lucy@tydrillbits.com.
