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