 |
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| 两向计数器; 正反向计数器 | |||
| 双向计数器 | |||
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| 正反向计数器; 加减计数器 | |||
| backward-forward counter: 8 phrases in 5 subjects |
| Agriculture | 2 |
| Computers | 1 |
| Information technology | 1 |
| Metallurgy | 2 |
| Technology | 2 |
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