???? ????? ?????? DNV GL: ???? ???? ????? ????

?????? ?? ???? ?????? ????? ??????? DNV GL ?? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ??? ?? ????? ?????? ????? ??? ???????? ????? ????? ?????? ?????? ??? ?????? ?? ??? DNV GL? ??? ????? ????? ????? ????? ???? ?? ??????? ???????? ??? ?????? ????? ??????? DNV GL ?????? ??? ?????? ?????? ????? ??????? ????? ??????? ??????? ???????. ??? ????????? ???? ?????? ?????? ?????? ??????? ?? ????? ?????? ?? ?????? ??????. ??? ???????? ?????? ??????? ????? ?? ????????? ???????? ??? ?? ??? ????? ????????? ?????? ???????? ?????? ??? ??????. ?? Shijiazhuang Deye Piping Industries Co., Ltd.? ??? ??????? ?????? ?????? ?????? ?????? ?????? ????????. ??? ?????? ?????? ????? ??????? DNV GL ?????? ??? ???? ????? ?????? ????????? ??? ?????? ?????? ?????? ??????? ??????? ??? ???? ??????? ?????????? ??? ????? ????. ???? ??? ????? ?????? ?????? ?? ?????? ????? ??????? DNV GL ???? ?????? ????? ???????? ???????