???? ???? NPT ???? ?????? ????? ???? | ????? ????!

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