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TheLeaningTowerofPisawasnotleaningwhenitwasbuiltin1173a...
问题详情:TheLeaningTowerofPisawasnotleaningwhenitwasbuiltin1173anditwasstraightlikeapole.Itstartedtoshiftdirectionsoonafterconstructionbecauseofpoorfoundationinadditiontothelooselayerofsubsoil(底土).At...