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保密系统
avia.
secrecy system
mil., air.def.
primary system
space
privacy system
;
protected system
保密系统:
43 phrases
in 10 subjects
Air defense
8
Automobiles
3
Aviation
4
Computer networks
2
Cryptography
1
Electronics
7
Information technology
1
Space
13
Technology
3
Telecommunications
1
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