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| 水平单火管锅炉 | |||
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| 内烟道锅炉; 科尼斯式锅炉; 单炉筒锅炉; 柯尼什卧式锅炉; 单火管锅炉 | |||
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cornish boiler : 1 phrase in 1 subject |
| Technology | 1 |
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