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主要的系统频率
el. prevailing system frequency
系统频率
avia. system frequency
系统 频率
: 56 phrases in 14 subjects
Aerohydrodynamics1
Agriculture2
Air defense6
Aviation6
Earth sciences3
Electronics12
General1
Information technology1
Nuclear and fusion power1
Oil / petroleum2
Shipbuilding3
Space9
Technology8
Telecommunications1

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