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????2??22???(??????? ??????????????)??DN1600?21???,???????????????????,???21?????????,??????,?????????400???

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?21?21???50?????????????????????????,??,?,????????22??3??????????????,??,??????????

?????????21????????????,???????,????????????????????????????,???????????????????????????????????????????????????????????????????????????????????????????15?,??

2???21??????????????????,???????DN1600??,???????????????????????? ??

????????,??21???21??,??????????????????33??,??????????400??????????????(?????)

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