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| 51. | algebraic difference |
| 代数差 |
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| 52. | hour angle difference |
| 子午圈角差;时角差 |
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| 53. | Difference gain |
| 差增益 |
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| 54. | logic difference |
| 逻辑差 |
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| 55. | upper deviation |
| 上差 |
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| 56. | equation of equinoxes |
| 分点差 |
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| 57. | have a poor constitution |
| 体质差 |
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| 58. | deviation shaft |
| 差轴 |
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| 59. | errors of compass |
| 罗经差 |
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| 60. | fortnightly inequality |
| 半月差 |
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