首先 先感谢各位大德 帮小妹解题 >.< 1.Which of the following companies is best know for producing PC-compatible systeam units? (A)apple (B)Microsoft (c)Motorola (d)Compaq (e)Corel 疑惑:这题不是说哪家公司所做出的电脑 电脑系统相容性最好? 其实我二话不说 就选B 但是答案却是D 上网查了一下 除了发现他是个电脑公司外 <原本不知-.-> 还有一些历史 还是搞不董.. 2.<91年台大> The basic assumption behind caching is (A)data/file is accessed will be accessed again (B)data/file that is recently accessed has high probability to be accessed again (C)data/file that is recently accessed will be accessed again (D)data/file that has not been accessed for a long time will likely to be accessed again (E)data/files are generally shared 这题完全不知道他在说什麽-_- 首先caching我不知道他在说啥-.- 希望有大大可以 帮我解释解释..答案是B 3.A machine cycle consists of two segments of time;instruction time and execution time. Which one is mainly used in the execution time ? (A)floating-point unit (B)decoder (c)system bus (d)cache 答案竟然是A ..完全没看过>.< 4.A 16-bit CPU with 16M byte a addressing is equipped with 256K X1 bit DRAM as the system main memory. The minimum memory storage capability of the system is_________ 唉 不是看不懂 只是不知道如何下手.. 5.If we have an error correcting code present as: Symbol Code A 00000 B 11000 C 01111 D 10011 (a)Could errors have corrected in the following message (i)10001 (ii)01001 (iii)11001 (iv)01101 这题答案写的很简短 我知道汉明码检查法 对於一个位元以上的错误 就无法更正了 而我是看答案才知道原来是ABCD里面要跟下面四个作互相检查的动作 ex:A与i 我的想法先由A与i这个组合开始 即检查00000 10001是否可以更正利用汉明码 8 4 2 1 1 0 0 0 0 2 0 0 0 0 3 0 0 0 0 4 0 0 0 0 5 0 0 0 0 6 0 1 1 0 7 0 0 0 0 8 0 0 0 0 9 0 0 0 0 10 1 0 1 0 ___________________ 1 1 0 0 转成十进位 为12 课本有另外例题说算出来是3 然後说是第三个bit 错误 ..但是现在这算出来是12 可是没有第12位元该怎麽办 >.< 小妹先问到这里 麻烦各位大大了 囧.. --

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