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41. | quality improvement |
| 质量改进 |
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42. | improvement planting |
| 改进栽植 |
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43. | fuel modification |
| 燃料改进 |
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44. | stability improvement |
| 稳定性改进 |
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45. | Improve on packing |
| 改进包装 |
|
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46. | modified simplex |
| 改进单纯形 |
|
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47. | operations improvement |
| 操作改进 |
|
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48. | Other Suggestion |
| 改进意见 |
|
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49. | corrective method |
| 改进方法 |
|
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50. | reliability improvement |
| 可靠性改进 |
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