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初步勘察 chūbù kānchá
bridg.constr. ground reconnaissance; preliminary investigation
hydroel.st. preliminary investigation (美国能源署勘察阶段分类)
tech. advance exploration; exploratory investigation; pilot survey; preliminary prospecting; scouting
初步勘察: 6 phrases in 3 subjects
Engineering geology2
Hydroelectric power stations2
Technology2