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