选频放大器 [电子] frequency selecting amplifier ; [电子] selective amplifier ; Bandpass amplifier ; electing frequency amplifier
选频电平表 [电子] selective level meter ; frequency selective level meter ; selective voltage and level meter
选频伏特计 frequency selective voltmeter ; selective voltmeter
中音选频 MID FREQ
选频滤光片 band-selelctive filter
选频网络 frequency selection network ; selecting frequency network
选频连接器 frequency selecting connector
选频铃 harmonic ringer
This structure use double 980nm laser diodes as its pump sources. Narrow line width laser is obtained by using fiber Bragg grating F-P frequency selection and feedback modulation method.
该结构采用980nm半导体激光器双向泵浦,利用光纤光栅法布罩.珀罗腔选频和反馈调节相结合的方法,获得窄线宽激光输出。
参考来源 - 谐振式光纤陀螺仪及窄线宽光纤激光器研究In the third part, the thesis focuses on the study of frequency selecting methods and system emulation and test.
三是选频方法的研究及系统仿真验证。
参考来源 - 高频电磁环境下随机跳频信号选频方法的研究This paper gives a method to measure the conductivity base on choosing frequency. After adding to the electrode with two AC square waves of appropriate frequencies,we can measure the output DC voltage of the circuit.
本论文提出了一种选频电导率测量方法，选择两个合适频率的交流方波施加于电极，测出电路输出直流电压，通过解方程组求出时间常数，然后求得溶液电阻，进而得到溶液电导率。
参考来源 - 溶液电导率测量方法的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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