请大家帮我概括一下这段英文的主要内容,急The first CPUs were from relay constructed as in the case of the Zuse Z3 ,followed by electron tubes like the Eniac .In the 1950s,the unreliable electronic tubes were replaced by transistors,w
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![请大家帮我概括一下这段英文的主要内容,急The first CPUs were from relay constructed as in the case of the Zuse Z3 ,followed by electron tubes like the Eniac .In the 1950s,the unreliable electronic tubes were replaced by transistors,w](/uploads/image/z/12656587-67-7.jpg?t=%E8%AF%B7%E5%A4%A7%E5%AE%B6%E5%B8%AE%E6%88%91%E6%A6%82%E6%8B%AC%E4%B8%80%E4%B8%8B%E8%BF%99%E6%AE%B5%E8%8B%B1%E6%96%87%E7%9A%84%E4%B8%BB%E8%A6%81%E5%86%85%E5%AE%B9%2C%E6%80%A5The+first+CPUs+were+from+relay+constructed+as+in+the+case+of+the+Zuse+Z3+%2Cfollowed+by+electron+tubes+like+the+Eniac+.In+the+1950s%2Cthe+unreliable+electronic+tubes+were+replaced+by+transistors%2Cw)
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