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| 31. | Ductile iron pipes--Bitumen coating |
| GB/T17459-1998球墨铸铁管沥青涂层 |
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| 32. | ductile cast iron pipe |
| 延性铸铁管 |
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| 33. | ductile and grey casting |
| 球墨和灰口铸铁 |
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| 34. | a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group. |
| 稀土属的三价金属元素，一种可延展的银白色铁磁体。 |
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| 35. | ductile cast iron roll |
| 可锻铁铸辊;可锻铸铁辊 |
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| 36. | Centrifugal casting ductile iron pipe |
| GB/T13295-1991离心铸造球墨铸铁管 |
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| 37. | the ductile minds of youth |
| 青年人的思想可塑性大 |
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| 38. | ductile Ni-resist cast iron |
| 高镍球墨铸铁 |
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| 39. | percentage of ductile fracture surface |
| 韧性断面率 |
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| 40. | ductile iron pipe with cement lining |
| 水泥衬里延性铁管；水泥衬里球墨铸铁管 |
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