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цементация цементирование
| природным газом
| цементация цементирование | |
| gen. | 渗碳; 表面硬化 |
| природный газ | |
| environ. | 天然气; 天然煤气; 天燃气; 天然气天然煤气 |
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| 渗碳; 表面硬化 | |||
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цементация цементирование : 6 phrases in 1 subject |
| General | 6 |
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