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频率比率
busin. frequency ratio
频率 比率: 47 phrases in 18 subjects
Air defense3
Artificial intelligence1
Automobiles1
Aviation1
Business2
Construction1
Electric machinery1
Electronics12
Engineering geology1
General1
Geophysics4
Multimedia1
Oil / petroleum4
Semiconductors1
Shipbuilding1
Space5
Statistics3
Technology4

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