Cov Ntaub Ntawv Xeem rau 1.2mm PP Cov Siv Tshem Tawm Quav

Cov Ntaub Ntawv Xeem rau 1.2mm PP Cov Siv Tshem Tawm Quav

Cov ntaub ntawv kev siv tshuab ntawm cov qaib tawb PP cov quav tshem tawm tau pom zoo los ntawm CNAS (Chinese National building materials test center).