Xin Tieu chuan API Spec 13A

Minh xin loi truoc la khong viet duoc tieng viet do bi loi
Minh dang can tieu chuan cua My ve Bentonite nhung tra mai khong thay o dau co
Ai co the tim cho minh duoc khong
hoac cho minh links
Thanks,.....mong BQT thong cam