Xov Xwm Txog Khoom
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Kev Xaiv Zoo Tshaj Plaws ntawm PDC Cutters rau Kev Ua Haujlwm Drilling
Tus yuam sij rau kev xaiv cov PDC cutters zoo yog nyob rau hauv "kev sib phim meej". Hais ncaj qha, qhov no txhais tau tias phim cov duab geometric ntawm lub cutter kom raug - txawm tias nws yog qhov tsim tiaj tiaj rau qhov ceev tshaj plaws ntawm kev khawb, hom semi-spherical rau kev ruaj khov mus sij hawm ntev, lossis ...Nyeem ntxiv
