????? ???? ??????? AWWA C515 ???? ?????? - ???? ?????? ??? ????????

?? ???? ??????? AWWA C515 ???? ????? ???? Shijiazhuang Deye Piping Industry Co., Ltd. ?? ???? ???? ?????? ???? ????????? ?? ????? ??????? ?????? ?????? ?????. ?? ????? ??? ?????? ????? ?????? AWWA C515? ??? ???? ???????? ???????? ?????? ???? ??????? AWWA C515 ?????? ??? ??? ?????? ?????? ???? ??????? ??? ????? ??? ????? ??????? ????????? ??? ????? ???? ?????. ?? ????? ?????? ?? ???? ????? ??????? ??? ???? ?????? ?????? ?????? ????? ???? ?????? ???? ??????? ??? ????? ??????? ????? ?? ?????????? ??? ?? ??? ????? ?????? ?????? ?????? ???? ?????? ???????. ?? ?????? ?????? ???????? ??????? ?????? ?????? ???? ???????? ???? ?????? ?? ???? ?????? ???????? ??????? ????? ???? Shijiazhuang Deye Piping Industry Co., Ltd. ?????? ?????? ????? ?????? ???? ???????? ??????? ??????? ?????? ???????. ?? ???????? ??????? ???? ???????? ???? ???? Shijiazhuang Deye Piping Industry Co., Ltd. ?????? ?????? ?????? ?? ??? ??????? ?????? ????? ??????