????? ??????

????? Huakai Group ?????? ?????? ??????? ?????? ? ?? ?????? ????? ??? ??????? ??? ????? ? ??? ????? ???? ????? ???????? ??? ????. ???? ?? ?? ???????? ???? ??????? ???????

GB / T 1040-1992 ????? ?????? ????? ???? ?????????

GB / T 1039-1992 ??????? ?????? ???? ?????? ?????? ??????????? ?????????

GB / T 5137.1-1996 ????? ?????? ??????? ??????????? ????? ???? ????????

GB / T 5137.2-1996 ????? ?????? ??????? ??????? ????? ???? ????????

GB / T 5137.3-1996 ????? ?????? ?????? ??????? ????? ??????? ??????? ???????? ??????? ???????? ????? ???? ????????