class frequency [数] 组频率 ; 组频次 ; 组次数 ; 组频度

logical class frequency [统计] 逻辑组频率

term class frequency 词类频率

DBH class frequency 胸径级频率

inverse class frequency 类别频率倒数

class frequency distribution 频数分布

One Class Resonant Frequency 一阶谐振频率

time-frequency distribution of cohen class cohen类时频分布