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advanced exploration; primary exploration | |||
original reconnaissance; preliminary investigation | |||
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preliminary investigation |
初勘 : 41 phrases in 8 subjects |
Bridge construction | 4 |
Consulting | 1 |
Drilling | 1 |
Earth sciences | 1 |
Engineering geology | 8 |
Hydroelectric power stations | 5 |
Oil / petroleum | 1 |
Technology | 20 |