Aichen, ib qho chaw tsim khoom lag luam thiab tsim kho hauv kev lag luam asphalt, tau nthuav dav nws qhov kev sib tsoo tshiab hauv kev siv tshuab lub ichen 8 - tuj splyphalt cog. Lub xeev no - ntawm - - Kos duab chaw teeb tsa tus qauv tshiab rau kev ua tau zoo, zoo, thiab e
Nyob rau hauv lub puas tau - hloov kho cov kev lag luam, qhob cib ua si lub luag haujlwm tseem ceeb li ntau yam, ruaj khov, thiab cov nqi tsev ua tau zoo. Kev tsim cov khoom lag luam tseem ceeb uas tsim nyog rau cov
Taw qhia rau qe pw tshuab ● Lub cav ntov qe, tseem hu ua cov qe qe ua tshuab, yog hom pob zeb ua rau saum npoo av thiab txav mus rau tom ntej. Nws yog wi