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| 41. | chronograph wheel |
| 秒计时轮 |
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| 42. | International Association for Time-Keeping |
| 国际计时协会 |
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| 43. | network protocol timing |
| 网络协议计时 |
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| 44. | time-count cycle |
| 计时循环[周期] |
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| 45. | automatic time switch |
| 自动计时开关 |
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| 46. | vertical timing relationship |
| 垂直计时关系 |
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| 47. | repetitive time method |
| 反复计时法 |
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| 48. | pocket chronometer |
| 精密计时怀表 |
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| 49. | crystal chronoscope equipment |
| 石英计时装置 |
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| 50. | timing current switch |
| 计时电流开关 |
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