???? ???? ???? ????? ?????? ?????? ??? ???? ???? ?? ????? ??????? ???????? ?????? ?????? (HVAC).

????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ???? ?????? ??????? ?????? ???? ?????? ?????? ???? ???????? ???? ???????? ????. ?? ????? ???? ?????? Double Sphere ????? ??? ?????? ????? ????? ?????? ???? ?????? ???? ???? ??????? ??? ???? ?????? ?????? ????? ???????? ????? ??? ????? ?? ???? ????? ??????? ???? ???? ?????? Double Sphere ????? ??? ??????? ??????? ?????? ???? ?????. ???? ??????? ??????? ?????? ????? ????? ??? ?????? ?????? ??????? ????? ?? ?????????. ?? ????? ?????? ????? ?????? ???? ????? ?????? ??? ???? ?? ??? ???? ?????? ??????? ?? ???? ???????? ????? ??? ???? ??? ??? ???????? ?????? ?? ????? ????? ?? ??????? ???????? ?????? ?????? ?? ????????? ???????? ??????? ??? ???? ?????? Double Sphere ????? ??? ?? ?????? ??????? ????? ??????? ????? ??????? ????? ???????? ????? ??. ?? ???????? ??????? ???? ???????? ????? ?? ??? ?? Shijiazhuang Deye Piping Industries Co., Ltd. ????? ???? ???????? ?????? ??. ???? ??? ????? ?????? ?????? ?? ???? ?????? Double Sphere ????? ??? ???? ???? ?? ???? ???????