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分级制
securit.
tiering approach
分级制
:
74 phrases
in 25 subjects
Agriculture
1
Air defense
1
Animal husbandry
9
Automobiles
3
Aviation
1
Computer networks
1
Desert science
1
Economy
1
Electric machinery
1
Electronics
7
Hydroelectric power stations
1
Information technology
3
Librarianship
1
Management
1
Mathematics
1
Metallurgy
1
Nursing
1
Oil / petroleum
2
Refrigeration
3
Securities
4
Space
4
Sports
1
Technology
18
Telecommunications
5
Wind Energy
2
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