gost-3749-77新版标准规范

T0CT3749-77M EXK I O C y I A P C T B E HH BI H C T AHIA P TyTOJIbHMKM IIOBEPOYHbIE 90TEXHNYECKNE YCJIOBNA3 aaune o中MuHa4OeHIK H3MATEIbCTBO CTAHJIAPTOBMocksaGOSTTOCT 3749-77,yronbHMKM noBepo ble 90 rpan.TexHINecxne ycnoBRChecking 90 degree C squares.Specifications