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| 21. | alternating current system |
| 交流制 |
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| 22. | A.C. welding machine |
| 交流电焊机 |
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| 23. | A.C.stabilized voltage supply |
| 交流稳压电源 |
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| 24. | alternating-current servomechanism |
| 交流伺服机构 |
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| 25. | mass exchange |
| 质量交流 |
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| 26. | alternating current characteristic |
| 交流特性 |
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| 27. | generator, alternating current, hydraulic |
| 交流水轮发电机 |
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| 28. | alternating supercurrent |
| 超导交流 |
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| 29. | alternating current ammeter |
| 交流电流表 |
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| 30. | alternating-current supervision |
| 交流控制 |
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