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