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| 21. | principle of flow |
| 流量原则 |
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| 22. | flow-after-flow test |
| 流量调整试井 |
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| 23. | flow control systems |
| 流量控制系统 |
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| 24. | flow control device |
| 流量控制器 |
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| 25. | dry weather flow |
| 旱季流量 |
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| 26. | flow meter factory |
| 流量仪表厂 |
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| 27. | minimum flow-rate |
| 最小流量 |
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| 28. | absolute flow rate |
| 绝对流量 |
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| 29. | multiphase flow rates |
| 多相流量 |
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| 30. | flow of freight |
| 货运流量 |
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