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| 51. | time-count cycle |
| 计时循环[周期] |
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| 52. | network protocol timing |
| 网络协议计时 |
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| 53. | automatic time switch |
| 自动计时开关 |
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| 54. | asynchronous timing |
| 异步计时法 |
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| 55. | repetitive time method |
| 反复计时法 |
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| 56. | pocket chronometer |
| 精密计时怀表 |
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| 57. | vertical timing relationship |
| 垂直计时关系 |
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| 58. | timing current switch |
| 计时电流开关 |
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| 59. | chronograph wheel |
| 秒计时轮 |
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| 60. | straight daywork |
| 直接计时制 |
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