A device which transmits an extremely narrow coherent beam of electromagnetic energy in the light spectrum.
在辐射光谱中单一频率的波呈现的一个很窄的带。
What schools are encouraged to do is to find out what kids can do across a very narrow spectrum of achievement.
學校只被要求 在狹窄範圍內探索學生潛力
The simulation results of a simple predictive modelbased on narrow band power spectral density spectrum colored noise forecast are also given.
并给出了窄带宽功率谱随机信号的预测法及仿真结果。
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