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关注:1
2013-05-23 12:21
求翻译:All ductwork shall be sized to provide the air volume and air velocity necessary to keep the duct interior clean and free of residual material是什么意思?![]() ![]() All ductwork shall be sized to provide the air volume and air velocity necessary to keep the duct interior clean and free of residual material
问题补充: |
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