Selective Availability (GPS satellite mode)什么意思

Situational Awareness态势感知能力 Surface-Air地对空 Special Agentn. 特工 Spectrum Analyzer谱线分析器 Sub-Assembly部件装配 System Administrator系统管理员 Semiactiveadj. 半活动的(半活性的) Safe/Arm安全/手臂 Supply Air (air conditioning)送风(空调) Ship Alteration船变更 Services/Agencies服务/机构 Semi-Annual (finance)本次(金融) Selective Availability (GPS satellite mode)选择性的可用性(GPS卫星模式) Service/Agency代理服务 Sand-to-Aggregate ratio (concrete)Sand-to-Aggregate比率(混凝土)