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| 行星齿轮传动 | |||
| 行星齿轮装置 | |||
| 行星传动; 周转轮系; 行星齿轮 (组) | |||
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| 行星传动; 周转轮系; 行星齿轮 (组) | |||
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epicyclic gearing : 1 phrase in 1 subject |
| Technology | 1 |
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