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勘探钻孔
bridg.constr. exploratory bore-hole
eng.geol. exploratory drill hole; pioneer hole; prospecting borehole; proving hole
hydroel.st. exploration borehole
oil exploratory boring
tech. exploratory hole; exploratory borehole; investigation hole; pioneer well; prospecting drill-hole
勘探 钻孔
: 10 phrases in 3 subjects
Bridge construction1
General1
Technology8

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