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硬岩层
met.
hard formation
tech.
hard layer
;
rock head
硬岩层
指变质岩或岩浆岩
dril.
hard rock
硬岩层:
18 phrases
in 7 subjects
Desert science
1
Drilling
4
Engineering geology
2
Explosives and Explosive Ordnance Disposal
1
General
1
Oil / petroleum
2
Technology
7
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