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