????? ??????? GGG50 - ??????? ????? ?? CE ????? ??????

????? ????? ??????? GGG50 ???? ?????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ?? ????? ?????? ?????? ???? ????????. ????? ????? ??????? ??? ?? ???? GGG50 ????? ??????? ??? ???? ??????? ??????? ???? ?????. ???? ????? ??????? GGG50 ?????? ??????? ????? ?? ?????????? ??? ?? ??? ??????? ?????? ??????? ???? ????? ????? ????? ???????? ????????. ????? ?????? ?????? ????? ?????? ????? ????????? ??? ?????? ?????? ??????? ???? ????? ????? ?? ??????? ?????. ????? ??????? ?????? ?????? ?????? ????? ???????? ????????? ??????? ???? ??????? ????? ?? ????? ????? ???????. ???? ?????? ??????? ??????? ??? ????? ????? ?????? ??????? ???????? ??? ???? ????? ??????? ?? ????? ?????. ????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ?????? ????? ?????? ????? ????? ??????. ??? ?????? ????? ??????? GGG50 ?????? ??? ???? ?????? ?????? ???????? ??? ???? ???? ??? ?? ?????? ?????????? ????????