Lub Pob Valve

Nrhiav cov pob valve zoo tshaj plaws ntawm cov nqi sib tw los ntawm cov chaw tsim khoom thiab cov neeg muag khoom hauv Suav teb. Tshawb nrhiav peb lub Hoobkas ncaj qha rau cov pob valve txhim khu kev qha.