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