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井下测量
earth.sc. underground survey
oil down-hole measurement
tech. downhole measurement; well-measurement
井下测量为指导和监督煤炭资源的开发，在井下特殊条件下所进行的测量工作
expl. underground survey
井 下 测量: 23 phrases in 8 subjects
Drilling3
Engineering geology1
Explosives and Explosive Ordnance Disposal1
General1
Geophysics5
Mining1
Oil / petroleum6
Technology5

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