Ob chav phab ntsa ntawv khob
Qhov no yog cov khoom tshiab ntawm cov txheej txheem rov ua dua tshiab. Cov txheej yog hu ua aqueous txheej uas yog tag nrho 100% yas tsis muaj thiab muaj cov khoom tsis zoo rau lub ntiaj teb.
PANDO muaj peev xwm muab koj nrog tag nrho cov kev pabcuam ntim khoom noj ntawm cov kws tshaj lij thiab kev sib tw ob chav phab ntsa ntawv khob tuam ntxhab thiab cov muag khoom hauv Suav teb. Txais tos yuav ob chav phab ntsa ntawv khob nrog peb thiab tau txais cov lus hais nrog peb lub Hoobkas.
