Valve hnab yog tsim tshwj xeeb rau kev kub ceev filling ntawm cov khoom.Valve hnab feem ntau yog siv rau ntim cov cement thiab lwm yam khoom.Cov khoom tuaj yeem raug sau ncaj qha los ntawm lub hose thiab thaum cov khoom tau ntim rau hauv lub brim lub valve kaw cia li muab lub kaw lus kaw.
Post lub sij hawm: Aug-20-2023