Cov pob zeb ua pob zeb yog cov khoom siv tseem ceeb hauv kev tsim kho kev lag luam thiab kev tsim cov blocks no yuav tsum tau siv cov tshuab tshwj xeeb xws li cov cement thaiv ua tshuab thiab thaiv cov tshuab xovxwm. Cov tshuab no ua lub luag haujlwm tseem ceeb hauv
Cov pob zeb ua si ua lub luag haujlwm tseem ceeb hauv kev tsim kho kev lag luam, ua haujlwm tseem ceeb hauv kev tsim vaj tsev, phab ntsa, thiab pavements. Raws li qhov kev thov rau cov pob zeb ua vaj tse nce, yog li qhov xav tau rau kev ua haujlwm zoo thiab ntau yam thaiv ua tshuab. Th
Kev ua vaj tse pob zeb yog ib qho tseem ceeb ntawm kev tsim kho niaj hnub no, nrog rau kev siv ntau lub tshuab tshwj xeeb tsim los ua kom tau raws li qhov xav tau ntau lawm. Tshawb nrhiav ntau hom tshuab siv los ua cov pob zeb ua vaj tse, lawv cov yam ntxwv, bene