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ThebirdandcatOnceuponatime.Therewasahouse.Besidethehousetherewasathebirdcage.Thebirdcagefelldowntothegroundknockingthebirdcage'sdooropen.Thebirdthenflewaway.Sothecatstartedtochasethebirdandthedogchasedthecat.Howeverthebirdflewontopofthetree.Sothecatstartedtoclimbthetreeandthedogbarkedatthecat.Beforethecatcouldreachthebird,thebirdflewaway.thiscausedthecattofalloutofthetree.Thedogthenranaway,Thebirdquicklyflewbackintohiscageandthemanfromthehousecarriedhimsafelyhome.
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本文标题：机械结构设计规范-每页放6张幻灯片-20170317
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