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有效波
el. useful wave
oil significant wave; effective wave
tech. effective wave (浪)
有 效波: 35 phrases in 18 subjects
Air defense1
Automobiles1
Aviation2
Chemistry1
Economy1
Electric machinery1
Electronics1
Engineering geology2
Explosives and Explosive Ordnance Disposal3
General1
Geophysics2
Hydroelectric power stations1
Information technology1
Nautical3
Oil / petroleum4
Space1
Technology8
Telecommunications1