???? ???? ??????? SDSS ???? ?????? ?????? ??? ???? ?????

???? ??????? SDSS ?? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?? ???? ???? ?????? ???? ??????? ????? ?? ????????? ????????. ????? ?? ??????? ??????? ????? ??????? ?????? (SDSS)? ???? ???? ??????? ??? ?????? ????????? ?????? ??????? ??? ????? ??????? ????????? ?? ??????? ??????? ???????? ??????. ????? ?????? ?????? ???? ???? ????? ??????? ???????? ?????? ??? ???? ??????? ?????? ?? ?????? . ??? ????? ?????? ?????? ??????? ??? ?????? ????????? ??????? ??????? ????????? ????????? ???????? ??? ???? ??? ???? ??????? SDSS ??? ??????? ????????? ??? ???? ?? ??? ?????? ?? ????? ??????? ???????. ?? ????? ?????? ???? ?????? ?????? ????? ???? ?????? ?? ??? ??????? ????????? ???????? ?? ?????? ??? ???????? ?????????? ?????? ?????? ?????? ?????? ??????? ??????? ???? ????? ?????? ???????? ??? ???? ??????? SDSS ?? ?????? ???????. ??????? ????? ?????? ?? ?? ???? ????? ????? ????????? ??????