ONORM M 7615 Teil 2-1987 Ventilation and air conditioning plants rectangular ducts andfittings of sheetmetal dimensions requirements measurement《通风设备和空调设备 金属薄板矩形风道和配尺寸,要求,测量》.pdf

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ONORM M 7615 Teil 2-1987 Ventilation and air conditioning plants rectangular ducts andfittings of sheetmetal dimensions requirements measurement《通风设备和空调设备 金属薄板矩形风道和配尺寸,要求,测量》.pdf_第3页
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ONORM M 7615 Teil 2-1987 Ventilation and air conditioning plants rectangular ducts andfittings of sheetmetal dimensions requirements measurement《通风设备和空调设备 金属薄板矩形风道和配尺寸,要求,测量》.pdf_第4页
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