???? ?? ????? ?????? ???? ???? ? ???? ????? ???? ?? ????? ????? ??? ???? ?? ???? ?? ????? ??? ?????? ??? ? ???? ??? ???? ?? ???? ?????. ??? ????? ????? ??????? ??? ???? ?? ???? ????????? ?????? ?? ????. ?????? ?? ????? ????? ?? ????? ?????? ???? ??????? ?????? ? ??????? ???????? ??? ???? ?????? ????.
????? ????? ???????? ?? ????? ????? ??? ??? ???: ????? ????? ? ???? ????? ????????? ????+?????? ?????????? ????????? ?????+?????? ????????? ?????? ??????????? ????+??? ???? ? ?????????? ??????
?????? ???? ????? ?? ??????? ???? ????? ??????? ? ????????? ????? ????????? ?????? ?????? ????. ?? ???? ????? ????? ?? ??????? ?? ????????? ???? ? ?????? ????? ?? ?? ??? ???????? ?? ??? ????? ???? ????? ???.
????? ????????? ???????: ????? ????=????? ??????? ???? - ????? ??? ????+???????? ????? ????+????????? ????+????????? ?????? ?????+????????? ?????? ????+????????? ?????????+????????? ??????+????????? ???????????????
????? ?? ???????? ????? ??? ???????? ???????? ?????? ??????? ?? ???????? ????? ? ???? ??????? ? ??? ???? ???????? ??????? ??? ??? ?? ?????? ????. ?????? ?? addition to the materials themselves, there are also costs including packaging fees, surface treatment fees, etc.
??? ??? ???? ????? ?????? ???? ???. ??? ????????? ????? ???????? ?????? ????? ????? ??? ??? ??????? ????? ????? ?? ?????. ?????? ????? ????? ?? Huzhou? Zhejiang? ????? ????? ?? ????? ??? ?????? ????? ? ????? ????? ????? ???.