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| 冲天炉工作门窗; 点火孔 | |||
| 清理门 | |||
| 清扫门; 除灰门 | |||
| 修炉口; 工作门; 清渣门; 清灰口 | |||
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cleaning door : 11 phrases in 3 subjects |
| General | 1 |
| Oil / petroleum | 1 |
| Technology | 9 |
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