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| directed scan; gated sweep | |||
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控制 扫描 : 49 phrases in 15 subjects |
| Air defense | 6 |
| Aviation | 4 |
| Business | 1 |
| Construction | 1 |
| Earth sciences | 4 |
| Electronics | 6 |
| General | 2 |
| Geology | 3 |
| Information technology | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Radio | 1 |
| Shipbuilding | 1 |
| Space | 4 |
| Technology | 13 |
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