Cov khoom
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YT27 pob zeb laum mine drilling rig cua pob zeb laum
Nrhiav rau cov cuab yeej zoo tagnrho rau txhua qhov kev tuav tes drilling?Gimarpol lub pob zeb xyaum yog koj xaiv zoo tshaj.Lawv muab cov qauv tsim kom yooj yim, tsis siv cua thiab yooj yim rau kev ua haujlwm.Nrog rau cov yam ntxwv ntawd, koj tuaj yeem suav nrog kev ua haujlwm siab, kev ua haujlwm ruaj khov thiab tus nqi saib xyuas qis.
