题目内容
同一规格的一批或一组零件，不经任何挑选，装配时不经调整和修配就能相互替换，装配后能满足使用性能要求，这样的一批零件就是具有互换性的零件。
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互换性的含义是什么？
Software is often divided into two basic types:system software and application software.
System softwareincludesthe operating system and system utilities.
Operating system is a collection of program modules that controls and manages the system’s hardware as well as software resources.
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