[問題] 漢明瑪及一些雜題
首先 先感謝各位大德 幫小妹解題 >.<
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:這題不是說哪家公司所做出的電腦 電腦系統相容性最好? 其實我二話不說
就選B 但是答案卻是D 上網查了一下 除了發現他是個電腦公司外 <原本不知-.->
還有一些歷史 還是搞不董..
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
這題完全不知道他在說什麼-_- 首先caching我不知道他在說啥-.- 希望有大大可以
幫我解釋解釋..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 ..完全沒看過>.<
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
這題答案寫的很簡短 我知道漢明碼檢查法 對於一個位元以上的錯誤 就無法更正了
而我是看答案才知道原來是ABCD裡面要跟下面四個作互相檢查的動作 ex:A與i
我的想法先由A與i這個組合開始 即檢查00000 10001是否可以更正利用漢明碼
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 轉成十進位 為12 課本有另外例題說算出來是3 然後說是第三個bit
錯誤 ..但是現在這算出來是12 可是沒有第12位元該怎麼辦 >.<
小妹先問到這裡 麻煩各位大大了 囧..
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