Hluav taws xob cua sov yog ib qho tseem ceeb ntawm cov txiv ntoo qhov chaw vuam txheej txheem, qhov twg cov ntaub ntawv siv hluav taws xob tswj tau ua lub luag haujlwm tseem ceeb hauv kev ua tiav cov welds txhim khu kev qha thiab zoo. Kab lus no muab cov ntsiab lus ntawm hluav taws xob cua sov hauv cov txiv ntoo qhov chaw vuam, sib tham txog nws qhov tseem ceeb, cov hauv paus ntsiab lus, thiab txiaj ntsig ...
Nyeem ntxiv