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标准信号 | |||
English thesaurus | |||
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specified signal (ssn) |
standard signal : 35 phrases in 10 subjects |
Air defense | 3 |
Aviation | 1 |
Chemistry | 1 |
Communications | 5 |
Earth sciences | 2 |
Geophysics | 1 |
Information technology | 1 |
Space | 2 |
Technology | 14 |
Telecommunications | 5 |