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选择频率
el. select frequency
选择 频率: 44 phrases in 17 subjects
Air defense8
Aviation2
Computer networks1
Dermatology1
Electric machinery1
Electronics6
General1
Geophysics3
Information technology1
Nautical2
Oil / petroleum1
Selective breeding1
Shipbuilding1
Space9
Technology4
Telecommunications1
United States1

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