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