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| 51. | speed threshold |
| 速度档位|速度档 |
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| 52. | speed increaser |
| 增速器升速器 |
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| 53. | speed indicator |
| 速度计 |
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| 54. | tensioning speed |
| 张拉速度 |
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| 55. | speed oscillation |
| 转速波动;转速振荡 |
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| 56. | speed stabilizer |
| 速度稳定器 |
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| 57. | speed regulation |
| 变速调节 |
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| 58. | synchronous speed |
| 同步速度 |
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| 59. | speed regulator |
| 蒂器速度蝶器 |
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| 60. | telegraph speed |
| 电报速度 |
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