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