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| Hydra steel (E型： 0.3C,3.5Cr, 9〜10W;Z 型：0.26C, 3Cr, 9 〜10W,0.5Mo,2.5Ni) | |||
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| Hydra metal (0.26~0.30C,3.0~3.5Cr,9~10W,0 ~0.5Mo,0~2.5Ni) | |||
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海 德 拉 钢 : 5 phrases in 2 subjects |
| Metallurgy | 3 |
| Technology | 2 |
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