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| 导叶 | |||
| 反应推进器; 反应螺旋桨 | |||
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| 整流舵; 反向旋转螺旋桨; 整流螺旋推进器 | |||
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contra propeller : 7 phrases in 2 subjects |
| Nautical | 2 |
| Technology | 5 |
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