信息安全 信息系统安全防护技术 释文 password aging 口令生命期
- precursor chemicals
- precursor effect
- precursor ion
- precursor nuclide
- precursor nuclide (nucleus)
- precursor nuclide of delayed neutron
- precursor object
- precursor of delayed proton emission
- precursor of nuclide
- precursor of the active ingredient
- precursor pulse
- precursor radiation
- precursors
- precursor spike
- precursor star
- precursor wave of storm surge
- predaceous fungi
- predation
- predation and parasitism
- predation behavior
- predative parasitism
- predator
- predator-prey interaction
- predator prey model
- predator-prey model