51吃瓜

?????? ??? ???? ?? ?????? ????? ??? ??? ?? ?? ???? ????? ????????? ???? ????. ?????? ??? ??????? ??? ?????? ?? ?????????? ??? ????? ????????? ????? ?????? ? ????? ?????? ?????????? ?? ???? ??????. ?????? ?????? ??? ???? ???? ????? ???????? ????? ?????? ?????? ????????? ?????? ??? ?? ??? ??????? ???? ??? ???????? ?? ??????? ????? ? ?????????? ?????? ?????? ???. ???? ?????? ??? ???? ?? ??? ??? ?? ???? ????? ?????? ???? ?? ???. ??????? ???? ????? ????? ? ???? ???????? ???????? ?? ???? ?????? ??? ???? ????? ???????. ?????? ??? ???? ?? ???? ?? ??? ??????? ??? ????? ??????? ??????? ???? ????? ??????? ? ?????? ????? ?? ?? ??????. ?? ???? ?????? ??? ??????? ?? ????????? ??????? ?????????? ?? ?? ?????? ?????? ??????? ? ????????? ??????? ????? ????? ????. ???? ?????? ??? ???? ?? ????? ?????? ??????? ??????. ???? ?????? ???? ????? ? ??? ?? ?????????? ?????????? ?? ????? ??? ???? ??? ????. ?? ???? ?????? ???? ???? ????? ??????? ???? ???????? ????? ???? ? ????? ???? ????? ???? ? ????? ????? ?? ???????? ????? ???. ?? addition, processing metal sheet can provide longer service life and higher structural stability for buildings. ?? ?????? ?????? ??? ??????? ?? ??? ??? ?? ????? ????? ?????? ?????????? ?? ???? ??????. ???????? ???????? ????? ???????? ? ??? ?? ?????. ?? ??????? ?????????? ??? ?? ???? ?????? ??? ???? ???? ???????. ???????? ???? ??????? ????? ???? ?????? ? ????? ?????? ?????????????? ??? ????? ?? ???????? ???? ??? ??? ?? ???? ??? ? ?? ????? ??????? ?????????? ?????? ???. ?? summary, processing metal sheet has important application value in various fields. ?? ???? ???????? ??????? ???? ????? ???? ??????? ??? ?? ???? ???? ???? ??????? ?????? ????? ? ????? ??????? ?????? ?? ?? ???? ???. ?????? ??? ???? ??? ??????? ???????? ?? ????????? ????? ????? ?????? ????? ?????? ? ????? ?????? ?????????? ?? ???? ??????.