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Cov Hydrocarbon Resins rau Cov Nplaum: Ib qho Kev daws teeb meem muaj zog
Hauv lub ntiaj teb niaj hnub no uas muaj kev kub ceev, qhov xav tau cov nplaum uas ua haujlwm tau zoo thiab txhim khu kev qha yog qhov tseem ceeb heev. Cov lag luam xws li kev ntim khoom mus rau kev tsim kho tsheb vam khom cov nplaum kom muab cov nplaum uas ruaj khov thiab kav ntev. Ib qho khoom xyaw tseem ceeb uas ua lub luag haujlwm tseem ceeb hauv kev tsim cov khoom siv siab...Nyeem ntxiv