Kev tsim cov txheej txheem kev kawm rau cov khoom xyaw nquag
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Kev tsim cov txheej txheem kev kawm rau cov khoom xyaw nquag
Thaum cov khoom muaj txiaj ntsig raug kaw, nws tseem ceeb heev rau kev ua haujlwm ntawm yuav ua li cas tsim nws nrog tus nqi zoo tshaj. Peb pab neeg tuaj yeem tsim cov txheej txheem tsim khoom zoo tshaj plaws rau peb cov neeg siv khoom txhawm rau txhim kho kev sib tw thiab txo qis rau qhov xwm txheej. Peb cov kev pabcuam suav nrog pretreatment ntawm cov khoom siv raw, kev ua haujlwm ntxiv (xws li purification, abstraction, drying, etc.). Cov tsis tseem ceeb raws li tau teev tseg saum toj no tuaj yeem yog qhov tseem ceeb heev hauv kev txiav txim siab qhov ua tiav ntawm kev tsim khoom.
