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| 用户精度选择机制 (对非美国防部规定的用户，该机制起作用时，全球定位系统导航精度将降低); 用户精度选择能力 (对非美国防部规定的用户，控制全球定位系统导航精度的能力) | |||
| 选择可靠性 | |||
| 选择有效性 | |||
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| 选择可用性; 低精确度格式; 限制格式; SA干扰 | |||
| English thesaurus | |||
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| SA (GPS) | |||
| SA | |||
| selective availability: 3 phrases in 2 subjects |
| Aviation | 1 |
| Space | 2 |
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