???? ???? ????? GGG50 ???? ?????? ????????? ???????

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