Asphalt roj yog qhov ua tau rau hluav taws kub heev.
Raws li ib tug derivative ntawm roj av, asphalt inherently muaj cov khoom siv hluav taws xob thiab tsis muaj kev tiv thaiv hluav taws.
Asphalt roj yog qhov ua tau rau hluav taws kub heev.
Raws li ib tug derivative ntawm roj av, asphalt inherently muaj cov khoom siv hluav taws xob thiab tsis muaj kev tiv thaiv hluav taws.