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| 索引层 | |||
| 指示水准器; 变址级 | |||
| index level: 19 phrases in 11 subjects |
| Aviation | 1 |
| Business | 2 |
| Drilling | 1 |
| Earth sciences | 1 |
| Electronics | 2 |
| Finances | 2 |
| Information technology | 2 |
| Mathematics | 1 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 5 |
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