 |
| |||
| 平均服务时间 | |||
| 平均使用时间 | |||
| 平均工作寿命 | |||
| mean service time: 20 phrases in 6 subjects |
| Aviation | 3 |
| Computer networks | 2 |
| Electronics | 7 |
| Rail transport | 1 |
| Space | 1 |
| Telecommunications | 6 |
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