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维护时间: 42 phrases in 11 subjects |
Agriculture | 3 |
Automobiles | 2 |
Aviation | 1 |
Business | 1 |
Economy | 1 |
Electronics | 11 |
Information technology | 6 |
Shipbuilding | 1 |
Space | 4 |
Technology | 5 |
Telecommunications | 7 |