???? ???? GGG40/50 ???? ?????? ?????? ?? ?????? ???? ?????

?? ?????? ?????? GGG40/50 ???? ????? ???? Shijiazhuang Deye Piping Industry Co., Ltd. ?? ???? ????? ???? ?????? ???? ?????? ?????????. ????? ?? ???? GGG40/50 ???????? ??? ?????? ?????? ????? ????????? ?? ???? ???????? ???? ???? ????? ?????? ?????? ???????? ?????? ??? ??????? ??????? ?? ???? ??? ?????? ?????? ???? ??? ?????? ?????? ????? ??????? ?????? ????? ?????. . ??? ????? ?????? ???? ???????? ??? ???? ???? ?????? ?? ?????? ????? ????? ????? ??? ?? ????? ??????. ?? ????? ?????? ????? ????? ???? ????? ?????? ??????? ???????? ???? Shijiazhuang Deye Piping Industry Co., Ltd. ?????? ?????? ?????? ?? ?????? ??????? ??????? ?????? GGG40/50 ??? ????????. ???? ?? ???????? ?? ??????? ?????????? ?? ????? ?????? ?????? ?? ????? ?? ????????? ????????? ??? ?? ????? ??? ?????? ?????? ?????? ???? ?????? ?????? ???????? ???? ????? ?????? ??????? ?????? ??? ?????? ?????? GGG40/50 ?? ????? ???????? Shijiazhuang Deye Co., Ltd. ?? ?????? ?????? ????????? ???????? ??????