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| 51. | colour IF alignment |
| 彩色中频调整 |
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| 52. | medium frequency bending of pipe |
| 中频弯管 |
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| 53. | medium frequency induction melting furnace |
| 中频感应熔炼炉 |
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| 54. | intermediate frequency response ratio |
| 中频响应比 |
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| 55. | medium-frequency positioning system |
| 中频定位系统 |
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| 56. | IF heterodyne repeater |
| 中频外差增音机 |
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| 57. | intermediate frequency voltmeter |
| 中频伏特表 |
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| 58. | sound intermediate-frequency detector |
| 声中频检波器 |
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| 59. | IF tuning circuit |
| 中频调谐电路 |
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| 60. | IF branching station |
| 中频分支站 |
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