?????? ??????? DSS: ?????? ????? ?????? ?????? ????????? ???????

???? ??????? Dss ?? ???? Shijiazhuang Deye Piping Industries Co.,Ltd. ?? ???? ???? ?????? ???? ??????? ????? ?? ????????? ????????. ????? ?? ??????? ??????? ????? ??????? (DSS)? ???? ???? ??????? ??? ?????? ????? ?????? ???????? ??????????? ??? ????? ??????? ??????? ?????? ??? ???????? ?????????? ?????? ?????? ?????? ?????? ??????? ??????? ?? ???? ???? ??????? ? ????? ????? ???? ???????? ???? ???? ??????? Dss ??????? ????? ??????? ????? ????????? ??? ???? ??????? ????? ???????. ????? ????? ????? ????? ???????? ????? ????? ?? ???? ?????? ?? ?????? ???? ???? ????? ????? ???? ???? ????? ?????? ???? ?????? ?????? ??? ???? ?????? ????? ??????? ???????? ??? ????? ??????? ?? ????? ???? ??????? Dss ?????? ??????? ????????? ?? ???? ?????? ?? ?????? ??????? ??????? ?????????. ?? ???????? ??????? ??????? ???????? Shijiazhuang Deye Piping Industries Co.,Ltd. ???? ??????? ????? ???? ??????? Dss ????????? ??????