phase modulation 调相†，相位调制
网络与数据通信 有线网络 释文 phase modulation, PM 相位调制
- special investigation project
- special investigative techniques
- special isoperimetric problem
- special issue
- special issue of a periodical
- Special Issue of Greater Chinese Lily
- Special Issue on Drama of New Youth
- specialist
- specialist degree
- specialist school
- speciality index
- speciality polymer
- speciality printing
- specialization
- specialization chain
- specialization class
- specialization cycle
- specialization for abundance
- specialization for scarcity
- specialization homomorphism
- specialization ideal
- specialization multiplicity
- specialization of a point
- specialization of a point x
- specialization ordering