可闻限下电报
subaudio telegraph
可闻限
threshold of audibility
可闻的
audible
可闻度
audibility
可闻码
audible code
可闻信号
audible signal
可闻音色
audible tones
静止频率
resting frequency
可编程序频率合成器
programmable frequency synthesizer
可变频率振荡器
variable frequency oscillator
刻蚀至频率
etching to frequency
空对地无线电频率
air-to-ground radio frequency
空间频率
spatial frequency
空腔调谐超外差型频率计
cavity-tuned absorption-type fr-cquency meter
空腔调谐传送型频率计
cavity-tuned heterodyne frequency meter
空腔谐振器频率计
cavity-resonatior frequency meter
困积频率
cumulative frequency
拉曼频率
Raman frequency; Raman shift
拉莫尔频率
Larmor frequency
精确产品可靠性
true product reliability