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| 51. | preliminary filter |
| 初步过滤|粗滤 |
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| 52. | preliminary crusher |
| 预先压碎机 |
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| 53. | preliminary designation |
| 初步命名 |
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| 54. | preliminary inquiry |
| 初级侦讯 |
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| 55. | preliminary discussion |
| 初步议论 |
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| 56. | preliminary filling |
| 预先装油 |
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| 57. | preliminary element |
| 初始要素 |
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| 58. | preliminary forecasting |
| 初步预测 |
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| 59. | preliminary examination |
| 初试 |
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| 60. | preliminary item |
| 开拓项目；开办项目；初步项目 |
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