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分界层
agric.
layer of separation
eng.geol.
key bed
oil
contact bed
分界层:
35 phrases
in 14 subjects
Aviation
6
Bridge construction
1
Chemistry
1
Electronics
1
Explosives and Explosive Ordnance Disposal
1
General
1
Geology
1
Hydroelectric power stations
1
Metallurgy
2
Nautical
1
Oil / petroleum
2
Space
2
Technology
10
Wind Energy
5
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