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