Qhov tshwj xeeb V-zoo li tus xaim profile tsim cov npoo- zoo li lub qhov uas nqaim ntawm qhov chaw thiab nthuav dav sab hauv. Qhov kev tsim no ua kom ntseeg tau tias cov khoom hla tau yooj yim yam tsis muaj qhov cuam tshuam, txo qhov kev pheej hmoo ntawm qhov muag tsis pom thiab clogging piv rau woven mesh.
