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Savery andNewcomen engines were similar EXCEPT:A.Both became relatively inexpen...

人的青春是那样的精彩，而自己的青春却始终是伴随着大摞大摞的书本，和永远做不完的作业。甚至连当红的超级女声和快乐男生都不知道。 　　墨是想挣脱的，她是想改变自己...