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

????? ??????? ??????????? ? ?? ??????? ????? ?????? ?????? ?????? PERT ????? ?????? ?????? ?????? PE ?????????. ?????? ???? ????? ?????? PE ????? ?????? ?? ??????? ? ???? Hubei AD Building Materials Co. ? Ltd. ?????? PERT ??????? ????? ???????? PERT ??? ?????? ?????? ?? ???????? ???????. ??? ?????? ???? ?? ?? ???? ?? ???? ?????? ????? ?????? ??????? ??? ?????? ?????? ???????. ?????? ?????? ???? ??? ????? ?????? ??????? ????????? ????? ?????? ?????? ????? ????? ?? ???????? ????? ??????? ????? ????? ????? ??????? ???????. ???????? ??? ??? ? ????? ???? Hubei AD Building Materials Co. ? Ltd. ????? ?????? ?????? ??????? ? ????? ????? ??????? ??????? ????? ?? ??????? ?? ?????? ???????? ???????? ??????? ??? ????? ?? ??? ?????. ???? ??? ????? ????? ????? ???? ?????? ?? ????? ???? ? ???? ?????? ????? ???? ?????? PERT ???????? ????? ????????? ???????. ??? ???? ???? ???????? ???? ?????? PERT ?? ??????? ???? ? ????? ??????? ?????? 17399989993 ? ??????? ???? Hubei AD Building Materials Co. ? Ltd. ??? ?????.

????? ????? PERT ??????? ????? ????? ??????? ??????? ????? ???? ??? ?? ?????? ?????? ?? ?????????? ????????? ??? ????? ??????? ???????. ???? ?? ???? ??? ????? ?????? ??????? ???? ????? ?? ??? Hubei AD Building Materials Co. ? Ltd. ??? ?? ?????? ?? ???????? ???????? ?????? ?????? ? ???? ?????? ???? ?????? PERT ??????? ? ??? ???? ????? ?????? ?????? ????? ????? ????????

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