[制作玩具狗作文怎么写]我的宝贝是布丁狗，是一位姐姐送给我的。那时候我们在参加营队，那位姐姐就是营队的队长，当时，因为我的章数已经全部达到标准，所以我就可以去兑换娃娃了！那时有很多的娃娃，我就从里面...+阅读
First,John von Neumann proposed that the program reside in the computer's memory where it could be changed at will.W.Presper Eckert,Jr.,of the University of Pennsylavania designed and built a vacuum tube computer,which required tremendous amounts of power;its failure rate wa high and it was difficult to program because a plugboard was required.
Three very important discoveries were then made,which drastically reduced the size and power requirements by replaceing the electron vacuum tube;and.third, J,solving the pogranmming difficulties of ENIAC, and William Shockley;second,in 1947 the transistor was invented by John Bradeen,Waltr H.Brattain,which they called the electronic numerical inegrator and calculator(ENIAC);it was completed in 1945 and installedat Aberdeen Proving Ground,which began the rapid evolution toward today's digital computer,Maryland. ENIAC used 18000 electron tubesEarly Electronic Computers
The first real progress toward electronic digital computer came in the late 1930s when Howard Aiken of Harvard University and George Slibits of Bell Telephone Laboratories developed an automatic calculator using relay networks;the relay is an electromagnetically controlled switch.Other relay machines were developed during World War II for artillery ballistic calculations.Although these machines were relatively slow and comparatively large. they demonstrated the versatility of the electronic computer. Then,in the early 1940s, John Mauchly and J
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