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什么是计算机系统、计算机硬件和计算机软件？硬件和软件哪个更重要？

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如何理解计算机系统的层次结构？

说明高级语言、汇编语言和机器语言的差别及联系。

Fill in the blanks by selecting suitable words from the word bank. You may not use any of the words more than once. 注意：只需输入选项字母，不要输入所选单词。A. withdraw B.declineC.interfering D. burningE. compromising F.reliable G.opportunity H. schedulesI. decrease J.generate K.committing L. contrastingM. consistent N.flexible O.circumstancesNowadays college education cost is rising sharply. More and more college students have to work in order to 1)___income to support themselves. But how can you prevent working from 2)_ with your study?Firstly, plan your class and work 3)_ as far ahead as possible. Arrange your classes in a way so that you have one or two days for work.Secondly, use time well instead of 4)_ the midnight oil. Studying late until midnight may make you tired and take a(n) 5)_ toll on your health. Use those 10 minutes waiting for the bus to read a few more pages. If your job has a lot of downtime (自由支配时间), use the 6) to do school assignments. Never try to cut corners by copying assignments from other students.Thirdly, set a goal for your academic performance. You'll probably have to 7)_ your work hours, or even, if possible and necessary, 8)_from the workforce to be successful in study. After all, it is not a good idea to risk 9)_ your student career with part-time jobs.Fourthly, inform all your professors, teaching assistants and employers about your situation so that they can be 10)__ as well. Winning their support is the best way to keep them on your side.

解释概念：主机、CPU、主存、存储单元、存储元件、存储基元、存储元、存储字、存储字长、存储容量、机器字长、指令字长。