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51. | tool suBject |
| 工具学科 |
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52. | Rheology Tool |
| 流变学工具 |
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53. | chamfering tool |
| 去角刀具 |
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54. | fracturing tool |
| 压裂工具 |
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55. | assembling tool |
| 装配工具 |
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56. | scheduling tool |
| 调度工具 |
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57. | withdrawal tool |
| 拆卸工具 |
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58. | abrasive tool |
| 磨具 |
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59. | woodworking tool |
| 木工工具|木工刀具 |
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60. | nonsparking tool |
| 非铁合金工具 |
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