 |
| |||
| 选择衰减 | |||
| 选择性衰落 (电离层密度变化引起信号的失真，故衰落随频率而变化) | |||
| 选择性衰落 (电离层密度变化引起信号的失真) | |||
| 选择性衰落 | |||
| selective fading: 8 phrases in 5 subjects |
| Air defense | 1 |
| Information technology | 1 |
| Space | 3 |
| Technology | 2 |
| Telecommunications | 1 |
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