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| 死区; 不灵敏区 | |||
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gap band : 28 phrases in 12 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Business | 1 |
| Chemistry | 1 |
| Electronics | 6 |
| General | 2 |
| Information technology | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Polymers | 1 |
| Space | 2 |
| Technology | 9 |
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