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