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| 41. | the bottom of the stairs |
| 楼梯底部 |
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| 42. | bottom outlet gate |
| 底部排水闸门 |
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| 43. | bottom lead type |
| 底部引线型 |
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| 44. | Product Modeling Technology and Application for Supporting Bottom Up Design |
| 支持Bottom up设计过程的产品建模技术及应用 |
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| 45. | bottom outlet orifice |
| 底部放水孔口 |
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| 46. | bottom collimator |
| 底部准直仪 |
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| 47. | bottom friction |
| 底部摩擦；海底摩擦力 |
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| 48. | the bottom of a house |
| 房屋底部 |
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| 49. | bottom assemblies |
| 底部钻具组合 |
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| 50. | bottom flushing of sediment |
| 底部排沙 |
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