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| 41. | dual foreign exchange market |
| 双重外汇市场 |
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| 42. | dual structure of economy |
| 双重经济结构 |
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| 43. | dual transmission |
| 双重传输 |
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| 44. | double porosity |
| 双重孔隙 |
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| 45. | dual-control columns |
| 双重操纵杆 |
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| 46. | dual broadcasting |
| 双重广播 |
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| 47. | duplicate detector |
| 双重检测器 |
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| 48. | double benefits |
| 双重福利 |
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| 49. | duplication of marking |
| 双重标志 |
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| 50. | double projection |
| 双重投影 |
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