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| 51. | timing impulse generator |
| 计时脉冲发生器 |
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| 52. | timing current switch |
| 计时电流开关 |
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| 53. | asynchronous timing |
| 异步计时法 |
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| 54. | antique horologes |
| 古代计时仪器 |
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| 55. | straight daywork |
| 直接计时制 |
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| 56. | time kicking |
| 打腿计时 |
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| 57. | stopwatch time method |
| 跑表计时法 |
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| 58. | chronometric radiosonde |
| 计时无线电探空仪 |
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| 59. | subscription [toll] television |
| 计时收费电视 |
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| 60. | self-timing anemometer |
| 自动计时风速计 |
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