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| 初步调研 | |||
| 初步勘察; 初步调査 | |||
| 初步调查; 初步研究 | |||
| 初步勘察 (美国能源署勘察阶段分类); 初查; 踏勘; 初步查勘 | |||
| 初期勘测; 初勘; 初步查勘 | |||
| preliminary investigation: 9 phrases in 4 subjects |
| Aviation | 1 |
| Consulting | 1 |
| Engineering geology | 2 |
| Technology | 5 |
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