???? ????? ??????? GGG40: ???? ???????? ?????????

????? ????? ??????? GGG40 ???? ?????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ?? ???? ????? ?????? ?????? ???? ????????. ??? ??????? ?????? ?? ???? ???????? GGG40 ???? ??????? ??? ???? ????? ?????? ?????? ???? ?????. ???? ????? ??????? GGG40 ?????? ??????? ????? ?? ?????????? ??? ?? ??? ????? ??????? ?????? ?????? ????? ?????? ?????. ????? ?????? ???? ???? ?????????? ??? ???? ???????? ???????? ????? ?????? ??? ?????? ??? ????? ?? ????? ??????. ???? ????? ??????? ????? ??????? ??????? ?? ??? ???? ???????? ???????? ????? ?? ??????? ???????? ????????? ??????. ??? ?????? ?????? ?????? ?????? ????? ???????? ????????? ??? ?????? ???? ????? ??????????? ??????? ?????? ??????? ????? ????????. ???? ?????? ?????? ???????? ???????? ???? ????? ??????? GGG40 ??????? ????? ??????? ?? ??????? ??? ????? ?? ??????? ?????? ?????? ???? ???? ????????. ???? ??? ????? ?????? ?????? ?? ????? ??????? ????? ?????? ????? ???? ?????? ?? ???? ?????? ??????? ???????? ?????? ??