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标志信号
agric., IT
notch
mil., air.def.
call sign
telecom.
marking signal
标志信号:
25 phrases
in 10 subjects
Air defense
1
Automobiles
1
Communications
4
Electronics
1
General
1
Geophysics
1
Metallurgy
1
Rail transport
2
Technology
10
Telecommunications
3
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