网络与数据通信 协议体系与组成结构 释文 service data unit, SDU 服务数据单元
- positivism methodology of psychology
- positivism policy analysis
- positivist history
- positivistic sociology
- positivist jurisprudence
- positivity
- positivity axiom
- positivity domain
- positivity property
- positizable operator
- positroid boundaries
- positroid stratification
- positron
- positron-annihilation apparatus
- positron annihilation spectroscopy
- positron annihilation spectroscopy (PAS)
- positron annihilation technique
- positron-annihilation technique
- positron-electron annihilation
- positron emission
- positron emission mammography
- positron emission tomography
- positron-emission tomography
- positron emission tomography-computed tomography
- positron emission tomography/computed tomography