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桌面操作系统的研究开发指导思想是尽可能在不改变自身的前提下具有广泛的适应性。也就是说：不论应用环境怎么变化，好都不要对自身内部产生什么影响，也不要求自身做太多的变化。反过来，应用于嵌入式环境的RTOS，在研发的时候就必须立足于改变自身、开放自身，让开发人员可以根据硬件环境和应用环境的不同而对操作系统进行灵活的裁剪和配置，因为对于任何一个具体的嵌入式设备，它的功能是确定的，因此只要从原有操作系统中把这个特定应用所需的功能拿进来即可。
应当指出的是：如果一个操作系统平台只能依靠手工的方式去掉一些代码，这根本就不是可裁剪性。所谓可裁剪性是在软件工程阶段利用软件配置方法实现软件构件的“即插即用”。
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