周期: period; cycle; circle; revol ...频率: frequency; rate周期频率调制: periodic frequency modulation周期频率特性: period-frequency relation周期频率特性滤波器: periodic filter长期频率: long run frequency长期频率漂移: long-term frequency drift定期频率预报: periodical frequency forecast长期频率稳定度: long-term frequency stability短期频率稳定度: short term frequency stability; short-term frequency stability频率差周期: frequency-difference cycle频率周期: frequency period频率飘动周期: periodicity of frequency wobbling周期函数频率: frequency of periodic frunction短周期振荡频率: weathercock frequency短周期振动频率: short-period frequency时钟周期时钟频率: clock cycle clock rate周期: period; cycle; circle; revolution; round; complete alternation 产业周期 industrial cycle; 经济周期 economic cycle; 商业周期 business cycle; trade cycle; 生产周期 production cycle; 再生产周期 cycle of reproduction; 缩短恢复周期 shorten the period of convalescence; 固有周期 natural period; 延长支付周期 extend a payment period; 昆虫的生活周期 the life cycle of insects; 工作周期 action cycle; 周期变化 periodic change; periodic variation; 周期表 [化学] periodic table; periodic chart; 周期律 [化学] periodic law; law of periodicity 频率: frequency; rate 超低频率 ultra-low frequency; 超高频率 ultra-high frequency; 低频率 low frequency; 高频率 high frequency; 甚高频率 very high frequency; 中频率 medium frequency; 频率变换 frequency transformation; frequency conversion; frequency transposition; 频率表 frequency list; 频率分布 frequency distribution; 频率共用 frequency sharing; 频率共用电路 frequency-sharing circuit; 频率合成器 frequency synthesizer; 频率互换 [讯] frequency frogging; 频率计 frequency meter; frequency indicator; cymometer; 频率校准 frequency calibration; 频率选择 frequency selection; 频率转换 frequency conversion; 频率转换开关 frequency-changeover switch大周期, 主周期: main cycle假频率,伪频率: pseudofrequency累计频率(频率): cumulative frequency伪频率,假频率: pseudo frequency1周期: g 12周期: g 2