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| 21. | digital transversal filter |
| 数字式横向滤波器 |
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| 22. | A digital clock. |
| 数字式钟 |
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| 23. | digital transducer |
| 数字式传感器 |
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| 24. | digital answering machine |
| 数字式应答机 |
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| 25. | digital data recorder |
| 数字式记录器 |
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| 26. | digital positioner |
| 数字式定位器 |
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| 27. | digital gate circuit |
| 数字式门电路 |
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| 28. | numeric keyboard |
| 数字式键盘 |
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| 29. | digital local oscillator |
| 数字式本机振荡器 |
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| 30. | digital controlled |
| 数字式控制 |
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