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| 表面硬化层深度 | |||
| 表面渗碳深度 | |||
| 表面硬化层深度 | |||
| 渗碳层厚度; 表面硬化深度 | |||
| 渗碳层深度 | |||
| 表面深度 | |||
| case depth: 18 phrases in 8 subjects |
| Automobiles | 3 |
| Construction | 1 |
| General | 1 |
| Metallurgy | 6 |
| Shipbuilding | 1 |
| Steel production | 1 |
| Technology | 4 |
| Wind Energy | 1 |
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