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| system availability | |||
| 系统可用性: 16 phrases in 9 subjects |
| Aviation | 1 |
| Communications | 1 |
| Economy | 2 |
| Electronics | 4 |
| Nautical | 1 |
| Refrigeration | 2 |
| Space | 2 |
| Technology | 1 |
| Telecommunications | 2 |
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