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| 51. | rationalization of insulation |
| 绝缘配合;绝缘配合 |
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| 52. | inverted-arch floor |
| 倒拱底板 |
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| 53. | enlarging board |
| 放大机底板 |
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| 54. | track insulation |
| 轨道绝缘|钢轨绝缘 |
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| 55. | scraper ground plate |
| 扒斗底板 |
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| 56. | insulation ag(e)ing |
| 绝缘老化;绝缘老化 |
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| 57. | adjustable shoe sole |
| 可调刹车底板 |
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| 58. | clay brick insulatio |
| 耐火砖绝缘|粘土砖绝缘 |
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| 59. | insulation allowance |
| 绝缘公差;绝缘公差;绝缘容差;绝缘容差 |
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| 60. | fluid insulation |
| 流体绝缘|液体绝缘 |
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