... primary frequency regulation 一次频率调节 primary frequency standard 一级频率标准,基本频率标准 primary impedance 一次绕组阻抗 ...
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... primary frequency 基本频率 primary frequency standard 基本频率标准 primary fuel cell 原燃料电池 ...
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5071A Primary Frequency Standard 铯原子钟
frequency primary standard 频率基准
primary time and frequency standard 原级时频标准
primary cesium beam frequency standard 原级铯射束频率标准
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