1. Siv lub tshuab raj ua lub tshuab raj kom qhuav rapeseeds, uas muaj cov dej noo ntau dua. Txhawm rau kom ntseeg tau tiav ziab kom qhuav thiab ua kom tiav cov nyhuv, qhov kub ntawm cov pa kub yuav tsum tswj nyob ntawm 100-200 degrees. Yog tias ziab noob rau noob qes, qhov kub ntawm cov cua kub yuav tsum tswj ntawm 40-60 degrees.
2. Rau cov noob qoob noob, nws yog qhov zoo los tswj qhov kub ntawm huab cua kub ntawm txog 40-60 degrees. Tus nqi sib txawv ntawm cov noob noob qhuav nyob rau hauv qhov kub no yog qhov siab heev. Yog tias koj xav kom qhuav cov nplej, qhov kub ntawm qhov cua kub tsis tuaj yeem qis dua 40 degrees lossis siab dua 100 degrees. Yog tias qhov ntsuas kub dhau los lossis poob qis dua qhov ntawm no, qhov ua kom qhuav thiab cov ua haujlwm zoo yuav raug cuam tshuam. Cov khoom siv yog pob kws, thiab qhov kub thiab txias yuav tsum tswj ntawm 80-140 degrees raws li cov dej noo.
