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21. | purchase of books |
| 图书采购 |
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22. | frequency of purchase |
| 采购频率 |
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23. | circular buying |
| 循环采购 |
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24. | purchasing Section |
| 采购科 |
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25. | Procurement Assistant |
| 采购助理 |
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26. | procurement system |
| 采购系统 |
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27. | Procurement Branch |
| 采购处 |
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28. | purchasing ordinances |
| 采购条例 |
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29. | procurement in bulk |
| 大批采购 |
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30. | purchase estimate |
| 采购估计 |
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