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