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