long cesium beam standard
... 伦敦穿透深度 London penetration depth 长铯束标准 long cesium beam standard 长计数器；全波计数器 long counter ...
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A portable laser system, continually working for very long period, is the key part in realization of an optically pumped cesium beam frequency standard.
长期连续工作的袖珍激光系统是实现实用的光抽运铯束频标的关键。
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