Testing for a passive surface is usually accomplished by looking for traces of free iron on the metal surface.
钝化表面的检测通常是通过查看金属表面的游离铁的踪迹来完成的。
This paper analyzes the basic features and characteristics of chaff, describes the radar testing technologies of such passive jammers, and discusses the development trend of these jammers.
详细分析箔条干扰物的基本性质和特性，介绍雷达无源干扰物效果检测技术，综述雷达无源干扰物的发展趋势。
The method of the passive optical component testing was analyzed.
综合分析了光无源器件的测试内容及测试方法。
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