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| refraction method | |||
| refracted prospecting; refraction prospection; refraction survey | |||
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折 射勘探法 : 12 phrases in 5 subjects |
| Engineering geology | 3 |
| Explosives and Explosive Ordnance Disposal | 5 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 2 |
| Technology | 1 |
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