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???????? ????? ???????? (HEC) ?? ???? ?????? ????? ??????????? ???? ?????? ????? ???????? ??????????? ??????? ??????? ?????????. ??????? ??? ?????? ??????? ??? ???? ???? ?? ????? ????????? ??? ?? ??? ???????? ??????? ???????? ???????. ????? HEC ?????? ??? ????? ???? ????? ?????????? ????? ????? ????? ????? ????? ?????? ??? ???? ?????? ?????? ?? ????? ?????????. ???? ???? Zhejiang Haishen New Materials Co., Ltd. ????? ????? ????? ?? HEC? ???? ???????? ????????? ?????? ??????? ??? ?? ????. ???????? ??? ??????? ???? ???????? ??? ????? HEC ????? ??? ???????? ????????? ?????? ???????? ????? ??????? ??????. ??? ???? ????? ?????? ?????? ??????? ????? ?????????? ?????? ????????. ???? ???? ??????? ?????? ??????? ??????? ?? ?????? ??????? ?? ????????? ??? ???????? ????? ???????? ?? ???? Zhejiang Haishen New Materials Co., Ltd. ?? ?????? ?????? ?????? ?????? ?????? ?????? ????????. ???????? ?????? ????? ??????? ?????????? ??? ????? ????.