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| 时钟脉冲 | |||
| 时钟信号 | |||
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clock signal : 12 phrases in 7 subjects |
| Air defense | 1 |
| Basketball | 1 |
| Metallurgy | 1 |
| Rail transport | 1 |
| Space | 1 |
| Technology | 6 |
| Telecommunications | 1 |
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