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