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