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