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signal unit
avia. 信号单位; 信号元; 信号装置
space 信号单元
signal unit: 103 phrases in 15 subjects
Agriculture1
Air defense4
Automobiles1
Aviation23
Business1
Earth sciences1
Electric machinery1
Electronics25
General2
Geophysics3
Information technology8
Military1
Space10
Technology11
Telecommunications11

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