Four element in one probe, two are wired and two are spare.

接线盒内有四个接线端子, 两根接线使用,两个接头备用!

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Teacher: What are the four element of nature?

老师: 自然的四个元素是什么?

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The dynamic infrared scene generation techniques were studied based on the four - element infrared seeking principle.

在分析四元红外导引头工作原理的基础上,讨论动态红外场景信号的生成技术.

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