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| 31. | bell ringing transformator |
| 电铃变压器 |
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| 32. | transformer testing instrument |
| 变压器测试仪 |
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| 33. | transformer testing |
| 变压器试验 |
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| 34. | supply transformer |
| 供电变压器 |
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| 35. | traction transformer |
| 牵引变压器 |
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| 36. | audio - transformer |
| 音频变压器 |
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| 37. | Berry transformator |
| 串联变压器 |
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| 38. | video - transformer |
| 视频变压器 |
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| 39. | a step - down transformer. |
| 降压变压器 |
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| 40. | electronic transformer |
| 电子变压器 |
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