您要查找的是不是：
- 差频APLL difference frequency APLL
- 晶体分频APLL Crystal frequency-division APLL
- 差频耦合 difference frequency coupling
- 差频过程 different frequency generation
- 差频控制 slip frequency control
- 差分 difference
- 标准差 root-mean-square error (RMS error)
- 频数 frequence
- 差一点 by a finger's breadth
- 差的 inferiors
- 主频 dominant frequency
- 倍频 frequency doubling
- 不差 little short of
- 载频 carrier frequency
- 差旅 travel
- 变差 variation of rate
- 频点 frequency point
- 越来越差 worse and worse
- 差速器 compensating gear
- 残差 residual error
