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幻灯
利用光线直线传播的特性,将图片或物体用光源均匀照明后放大投影到屏幕上,供多人观看的技术。通常又把幻灯片和幻灯机统称为幻灯。
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frequency factor
frequency-following response
frequency four-vector
frequency fraction
frequency function
frequency histogram
frequency hopping
frequency hopping technique
frequency hypothesis
frequency hysteresis
frequency indicator
frequency instability
frequency interval
frequency inversion
frequency jitter
frequency judge approach
frequency jumping
frequency locking
frequency-locking
frequency matching
frequency measurement
frequency measuring equipment
frequency meter
frequency meter, frequency counter
frequency method
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