系统: system频率: frequency; rate系统频率偏移: systemfrequencyexcursion系统频率特性: system response; system transient output response闭环系统频率特性: closed-loosystem frequency characteristic动态系统频率特性: dynamic system response; dynamic system respose开环系统频率特性: open-loosystem frequency characteristic电力系统频率允许偏差: quality of electric energy supplypermissible deviation of frequency for power systemem系统干扰性,系统频率特性,动态系统的反应: system transient output response动态系统频率特性, 动态系统的反应: dynamic system response系统干扰性 系统频率特性 瞬变过程: systemtransientoutputresponse频率系统: frequency system标准频率系统: standard frequency system反向频率系统: reverse direction frequency system频率程序系统: frequency-programming system频率分发系统: frequency and amplitude system频率跟踪系统: frequency tracker频率管理系统: fms frequency management system频率侦测系统: frequency surveillance system多频率勘探系统: multi-frequency exploration system宽偏频率调制系统: wide deviation frequency modulation system频率定时系统公司: frequency & time sys inc频率压缩信号系统: suppressed frequency signalling system频率自动控制系统: automatic frequency control system时间频率避碰系统: timefrequency collision avoidence system