YuLong Hom
Cov Ntsuas Dej Yaj = 20
Ua nyob rau hauv Suav teb
cov khoom siv hauv tsheb, cov ntaub ntawv tsim kho, cov khoom ua si, rooj tog.
Txoj Kev Ntsuas
ASTM D1238
ASTM D256
104
ASTM D785
42
60
2000 xyoo
90 xyoo
40