Cov khoom

Khoom siv:
dav siv hauv tshuab, khoom siv kho mob, khoom siv dag zog, Qizheng, tsheb ciav hlau ceev, tsheb, rooj tog, kho kom zoo nkauj thiab lwm yam.
Kev ua raws li tus qauv:

ASTM A554 Cov Lus Qhia Tshwj Xeeb

GB/T 12770

JIS G3446

TIAB SA 3030

TIAB SA 5363