Txheem rau txau saum npoo ntawm cov ntawv txhuas thiab lub thawv yas
Cov tsos tsim nyog yuav tsum tsis muaj qhov kawg, tsis muaj qhov nthuav tawm hauv qab, tsis muaj xim tsis xwm, pleev xim rau, sawv duav, thiab lwm yam.
Feem ntau, cov tuab ntawm cov hmoov txheej yuav tsum ntsib: 50-70 microns rau cov hmoov txheej du, 60-80 microns rau cov xuab zeb lis hmoov hmoov txheej
