(单选题)17: 根据UNIX操作系统的结构，（ ）通常称为Shell。
A: 工具层
B: 内核
C: 常驻模块层
D: 虚拟计算机
一、选择填空：阅读下面的对话或句子，从A、B、C三个选项中选出一个能填入空白处的最...
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1.(单选题)—Excuseme, —Yes,it's8633-2788.Ifyouhaveanyotherquestions,don'thesita...
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