Txij li thaum xyoo 1950, engineers tau ua tiav tsim nrog geomembranes.Kev siv cov geomembranes, tseem hu ua flexible membrane liners (FMLs), tau nce ntxiv vim muaj kev txhawj xeeb ntau ntxiv txog kev sib kis ntawm cov dej muaj txiaj ntsig.Ib txwm porous liners, xws li pob zeb, admi ...
Nyeem ntxiv