Hnub Kawg: Lub Kaum Hli 16, 2023 Cov ntsiab lus cement, pob zeb, thiab mortar tuaj yeem ua rau cov neeg uas nyuam qhuav pib tawm, tab sis qhov sib txawv ntawm cov cement yog cov hmoov sib tov zoo (tsis siv ib leeg), mortar yog tsim los ntawm cov cement thiab xuab zeb, thiab pob zeb yog ua los ntawm cov cement, xuab zeb, ib qho ...
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