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| 天花板凹灯槽 | |||
| 平顶暗装管形照明器 | |||
| 暗灯槽; 天花板凹槽; 灯槽; 槽形支架; 暗槽灯 | |||
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troffer : 7 phrases in 2 subjects |
| Refrigeration | 2 |
| Technology | 5 |
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