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