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计算机软件系统可分为应用系统和操作系统两大类
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声音的数字化技术是把声音转换成模拟信号
Fill the blanks with the words of this unit and pay attention to the correct forms (first letter of words are given):Employers must consider all candidates impartially and without b_______.
Make a rough s________ before you draw.
The tricks were meant to be seen only once; and when they are no longer a novelty and cease to d________, their effect is gone.
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