Thaum sivBITUMEN MELTING TSHUAB, kev ua haujlwm nyab xeeb yog qhov tseem ceeb {{} ua ntej, thiab cov khoom siv hluav taws xob yuav tsum tau txais cov hnab looj tes sov, thiab cov khoom ua haujlwm tau zoo .
Thaum cov khoom siv cua sov yuav tsum tau nruj me ntsis kom tsis txhob muaj kev cuam tshuam txog kev ua haujlwm los ntawm kev ua haujlwm hauv hluav taws kub {}}} nws yog txwv tsis pub kov high-kub qhov chaw ncaj qha nrog koj txhais tes thaum cov khoom siv khiav .
Yog tias muaj xwm txheej kub ntxhov, lub pob hluav taws xob ceev yuav tsum tau muab cov khoom siv tshwj xeeb, koj yuav tsum yaug cov khoom tshwj xeeb, thiab kho kom huv si kom txias ua ntej tu thiab tu kom tiv thaiv hlawv .
Kev tu ib txwm yog tseem ceeb {{}} Khij cov xwm txheej ntawm kev nyab xeeb ntawm cov neeg ua haujlwm muaj kev nyab xeeb ntawm cov cuab yeej ntawm lub neej ntawm cov khoom siv hluav taws xob {}}
