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| 多路存取系统; 多用户系统 | |||
| 多面交往系统 | |||
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multi -access system : 8 phrases in 6 subjects |
| Communications | 1 |
| Computers | 1 |
| Electronics | 2 |
| Geophysics | 1 |
| Space | 2 |
| Telecommunications | 1 |
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