Drilling siv lub cav

Yog tias koj tab tom nrhiav rau Suav teb siv drilling tshuab patented yees thiab zoo siv drilling siv lub tshuab cia muag rau Suav teb los ntawm kev siv drilling tshuab tsum thiab hoobkas, thov cuag hu Rejee kev lag luam.
Khoom