Due to frequent changes in, or varying combinations of, some types of equipment such as avionics and instrumentation, one or more separate documents for these products may be required.
答案解析
解析：
举个例子来帮助理解，想象一下你有一台电脑，里面的硬件设备可能包括CPU、显卡、内存等。如果你经常更换这些硬件设备，或者尝试不同的组合方式，那么你可能需要为每种组合或更换情况准备单独的文件来记录这些信息，以便更好地管理和维护这台电脑。这就是为什么有些设备可能需要单独的文件来描述的原因。
相关知识点：
设备变化可能需单独文档
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