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超前钻孔
el. advanced bore-hole
eng.geol. advance borehole; advanced hole; advancing boring; pilot hole
expl. summit hole
tech. advanced bore; advanced borehole; advanced drill hole; exploratory hole; exploratory borehole; pilot drill hole
超 前 钻孔
: 7 phrases in 3 subjects
Engineering geology2
Hydroelectric power stations1
Technology4

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