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| 量测时间间隔; 量测频率; 测量频率 | |||
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measuring frequency : 31 phrases in 9 subjects |
| Air defense | 4 |
| Aviation | 2 |
| Earth sciences | 1 |
| Electronics | 5 |
| Geophysics | 2 |
| Hydroelectric power stations | 1 |
| Mechanics | 2 |
| Oil / petroleum | 1 |
| Technology | 13 |
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