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特性时间
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characteristic time
特性时间
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43 phrases
in 15 subjects
Air defense
2
Artificial intelligence
1
Automobiles
1
Aviation
3
Business
2
Desert science
2
Ecology
1
Electric machinery
2
Electronics
8
General
1
Hydroelectric power stations
2
Psychology
1
Space
3
Technology
12
United Nations
2
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