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有效场
tech. effective field
无线电有效场
auto. useful field
有效场
: 46 phrases in 19 subjects
Agriculture1
Architecture1
Aviation1
Commerce1
Consulting1
Economy3
Electric machinery1
Electronics1
Engineering geology1
Finances10
Geophysics1
International Monetary Fund1
Marketing1
Metallurgy2
Oil / petroleum2
Refrigeration1
Securities7
Space3
Technology7

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