Cov khoom lag luam
Caasing pob tawb tiv thaiv cov qauv siv tsis muaj zog los ntawm cov pob tawb ntawm cov av nplaum thiab tom qab ntawd tso rau hauv qhov chaw nres nkoj.} Qhov ntau thiab tsawg yog muaj nyob ntawm 4-1 / 2 mus rau 20inch. cement cov hauj lwm pab tau rau hauv ib leeg lossis multistage cement {}}
Peb yog cov kev ua kom cov txiv xis tsim khoom thiab cov chaw muag khoom hauv Suav teb, tshwj xeeb hauv kev yuav cov kev sib tham zoo ntawm peb lub Hoobkas, tiv tauj peb .