Cov ntaub UD (Unidirectional) yog ib hom khoom siv fiber muaj zog heev uas txhua cov fibers raug sib dhos ua ib qho kev taw qhia. Nws tau muab txheej ua tus qauv hla (0° thiab 90°) kom tiv taus mos txwv tau zoo tshaj plaws thaum ua kom lub tsho tiv no tsis hnyav.
Lub sijhawm tshaj tawm: Tsib Hlis-28-2025