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| isodynamic line | |||
| strength contour | |||
| 等 强度 线: 22 phrases in 11 subjects |
| Agriculture | 2 |
| Air defense | 2 |
| Aviation | 1 |
| Bridge construction | 1 |
| Electric machinery | 1 |
| General | 3 |
| Otorhinolaryngology | 1 |
| Space | 2 |
| Technology | 7 |
| Telecommunications | 1 |
| Wind Energy | 1 |
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