Taw qhia ntawm excavator thoob hniav
Thoob cov hniav ntawm excavators yog cov khoom siv tseem ceeb ntawm

excavators.Lawv zoo ib yam li tib neeg cov hniav.Lawv yog

ua ke thoob cov hniav muaj li ntawm ib tug hniav rooj thiab ib tug hniav

tip, uas yog txuas nrog ib tug pin ncej.Raws li qhov tshwm sim tshwm sim

ntawm lub thoob cov hniav yog cov hniav hau, tsuas yog hloov lub taub.