信息安全 密码理论与技术 释文 symmetric cryptosystem 对称密码体制
- primary period
- primary phase zone
- primary phloem
- primary pinning force
- primary pit
- primary pollutant
- primary pollution
- primary preparation of stage design
- primary pressure standard
- primary prevention
- primary prevention of cancer
- primary problem
- primary processes of radiation chemistry
- primary process of radiation chemistry
- primary producer
- primary product
- primary production
- primary productivity
- primary productivity of waters
- primary progressive aphasia
- primary pseudoperfect number
- primary radiation
- primary radical
- primary radical termination
- primary radiometric thermometry