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| 21. | Course markers |
| 航向标志 |
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| 22. | direction of bias |
| 标准的偏向 |
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| 23. | angular derivation loss |
| 角偏向损失 |
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| 24. | directional gyroscope |
| 航向陀螺仪 |
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| 25. | deflecting force of the earth |
| 地球偏向力 |
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| 26. | The ball deflected to the left. |
| 球偏向左边。 |
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| 27. | constant deviation monochromator |
| 恒偏向单色仪 |
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| 28. | Vector correlation |
| 航向相关 |
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| 29. | constant deviation spectrograph |
| 恒偏向摄谱仪 |
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| 30. | beam off the beam |
| 脱离航向 |
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