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| 装箱渗碳硬化 | |||
| 堆集硬化 | |||
| 装箱渗碳硬化 | |||
| 表面硬化处理〈渗碳，渗氮等〉 | |||
| 堆集硬化 (在松散堆集的含碳材料中加温渗氮的硬化工艺) | |||
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| 装箱表面渗碳硬化 | |||
| 装箱表面硬化; 装箱渗碳; 装箱渗碳表面硬化 | |||
| 装箱渗碳硬化; 固体渗碳硬化 | |||
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pack hardening : 2 phrases in 1 subject |
| Metallurgy | 2 |
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