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???? ??????? ?? ???????? ???? 70℃
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?????? ????? ??????? ??????? (????) ?? ??????? ????? (????) ?????? ???? ????? ??? ????? ???? ??? ??? ?????? ??????? ???????? ?? ???? ?? " ??????? ??? ?????? 20 ????? ????? ??????? ???????? ????? ??? ???? ????? ????? ?? ????????? ?????? ???????" .
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600 ??? ???? ??????? ?????? ??????? ??????? C919
????? ???? ?????? ???? ??? ????????
?????? ????? ??? ????? ????? ?????? ?? ???? FTC-2000 ?? ?????
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????? ???? ?? ????? ???? ????? ???? ???? ??????? ??????? ??? ?????? 20000 ???
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