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