instantaneous frequency短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 瞬时频率 Instantaneous Frequency Measurement IFM receivers are important for modern electronic reconnaissance systems. 瞬时测频接收机是现代电子侦察系统的重要组成部分。71155 Instantaneous frequency measurementDIFM receiver is one of important component part of EW system. 瞬时测频接收机是电子战系统的重要组成部分之一。 cnki