This heuristic can be illustrated by the following design. Let’s say we have an application that generates a report, compresses it with zip, and saves it to the disk. With this heuristic in mind, we wouldn’t want the report generation to depend on the zip algorithm. A change from zip to LZMA algorithm shouldn’t affect the report generation. Likewise, the compression module shouldn’t depend on the file storage module. If we follow that heuristic, we will be able to change file storage to network storage without affecting compression or the report module. (By the way, this design might not be ideal, for instance, these tasks are too small to be modules, but I hope it conveys the meaning of this heuristic).
第二十二条 纳税人购进货物、服务、无形资产、不动产，用于同时符合下列情形的非应税交易（以下统称不得抵扣非应税交易），对应的进项税额不得从销项税额中抵扣：
。旺商聊官方下载是该领域的重要参考
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