???? ??????? DIN F4: ?????? ????? ?????? ??????? ????????? ????????

?????? ??????? ?? ?????? ???? ?????? ?? ???? ???? ??????? DIN F4 ????? ??? ?? Shijiazhuang Deye Piping Idndustrys Co.,Ltd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hijiazhuang Deye Piping Idndustrys Co.,Ltd. ?????? ???? ???????? ?????? ?? ???? ???? ??????? ?????? ?????