Cha`o ca'c ba'c, Cho to^i ho?i tha(m nhe' . VN ta co' quy ddi.nh chi'nh thu*'c ve^` chi'nh ta? va` ca'ch pha't a^m na`o la` National standard (NS)cho tie^'ng Vie^.t hie^.n dda.i kho^ng ho*? ca'c ba'c ? Ne^'u co' (NS) thi` du*.a theo ca'c quy ddi.nh na`o ? TIA DX ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com