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| 主轴 | |||
| 主轴线 | |||
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| 主轴线 | |||
| 主轴 | |||
| 一次晶轴 | |||
| 主轴线 | |||
| 主惯性轴 (同 principal inertia axis) | |||
| 主轴 (线); 光轴 | |||
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principal axes : 58 phrases in 9 subjects |
| Architecture | 1 |
| Aviation | 1 |
| Bridge construction | 11 |
| Earth sciences | 1 |
| Engineering geology | 4 |
| Hydroelectric power stations | 2 |
| Oil / petroleum | 2 |
| Space | 7 |
| Technology | 29 |
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