注：第一和第二止回阀模块的阀座和弹簧是不可互换的。较重的弹簧和较小直径的阀座属于第一止回阀模块。

Note: the seats and springs of the first and second check modules are not interchangeable. The heavier spring and smaller diameter seat belong with the first check module.

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尽管NIEM通过提供公共定义和技术而有助于互操作，但是两个使用不同niem子集的IEPD的XML文档是不可互换的。

Although NIEM helps interoperability by providing common definitions and techniques, XML documents from two IEPDs that use different subsets of NIEM are not interchangeable.

youdao

指出了加权和LMS算法的不可互换性。

It is proved that the weighting and the LMS algorithm can not be interchanged.

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