... 劲度矩阵 stiffness matrix 进排气通风 supply-exhaust ventilation 进气通风 supply ventilation ...
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进排气通风筒 down cast and up-take ventilator
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风雨 百叶窗设计用于进排气通风应用。
The Weatherproof louvre is designed for intake and exhaust ventilation applications.
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