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有效面
tech. significant surface; useful surface
天线的有效面
antenn. absorption plane
有效表面
met. active surface
有效 面: 408 phrases in 48 subjects
Agriculture6
Air defense7
Animal husbandry1
Architecture6
Automobiles11
Aviation13
Bridge construction20
Business1
Chemistry6
China1
Communications3
Compressors2
Computers1
Construction3
Cosmetics and cosmetology1
Drilling1
Earth sciences6
Ecology4
Economy3
Electric machinery8
Electronics17
Engineering geology5
Explosives and Explosive Ordnance Disposal3
Fencing3
General8
Geophysics2
Hydroelectric power stations7
Information technology3
Management1
Metallurgy53
Nautical2
Oil / petroleum12
Pest control1
Plastics9
Project management1
Radio1
Rail transport1
Refrigeration4
Securities1
Semiconductors2
Shipbuilding2
Space18
Sports1
Technology128
Telecommunications2
Tennis2
Textile industry2
Wind Energy13

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