The density, ventilation rate of gas and dust efficiency of the aluminium samples were measured.

研究了制作的工艺条件,测定材料的密度 、 透气度和除尘效率等性能.

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The location and ventilation rate the skylights will have a great influence on the wind field.

天窗的位置和天窗透风率的大小对风场起着决定性的影响.

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