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1)  frequency of surfing internet
上网频率
2)  superaudio frequency
声频上频率
3)  Frequency up-shifting
频率上移
1.
Frequency up-shifting induced by relativistic ionization front;
相对论电离波前导致的频率上移
4)  upper bound of frequence
上限频率
5)  upper frequency limit
频率上限
6)  power system frequency
电网频率
1.
The probability distribution with a Gaussian signal passing through a nonlinear function was discussed by the method of stochastic analysis,and the influence of several nonlinear factors on power system frequency probability distribution were presented.
用随机信号分析的方法研究具有正态分布的随机信号通过几种非线性环节后的概率分布特性,从而对电网中非线性环节对电网频率概率分布的影响进行研究。
补充资料:频率计量(见时间频率计量)


频率计量(见时间频率计量)
frequency metrology: see time and frequency metrology

  口n IQ liliang顷率频率计皿(f比quency metrolo盯) 计t。见时闰
  
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