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| 31. | open flow system |
| 开管流动系统 |
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| 32. | open shop system |
| 开放式机房系统 |
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| 33. | open ticket system |
| 开放式售票系统 |
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| 34. | open hypermedia system |
| 开放超媒体系统 |
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| 35. | open trench system |
| 明渠排水法 |
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| 36. | open access system |
| 开架借阅制 |
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| 37. | open tube system |
| 开管扩散系统 |
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| 38. | open growth system |
| 开放生长系统 |
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| 39. | open-field system |
| 露地耕作制 |
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| 40. | open loop system |
| 开圈系统 |
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