CUB KUB TSHUAJ HALEVETER

Peb nyob nraum zoo-lub npe hu ua ib qho ntawm kev haus cawv cov chaw tsim khoom hauv Suav teb. Yog tias koj yuav yuav haus dej cawv pheej yig hydrometer hauv Tshuag, txais tos kom tau txais cov lus hais thiab cov qauv dawb los ntawm peb lub hoobkas. Cov kev pabcuam zoo thiab tus nqi qis yog muaj.