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| 51. | level of base plate and support |
| 底板与支座标高 |
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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. | mounting brush of mother-of-pearl |
| 珍珠母制刷子底板 |
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| 55. | scraper ground plate |
| 扒斗底板 |
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| 56. | stone gobber |
| 【采矿】底板清理工 |
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| 57. | adjustable shoe sole |
| 可调刹车底板 |
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| 58. | double bottom tank top plating |
| 双层底内底板 |
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| 59. | air-operated control |
| 气动操纵;气压操纵 |
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| 60. | mounting brush of bone |
| 骨制刷子底板 |
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