DIN 4741-2-1987 Ventilation plant type 1 polypropylene (PP) uptakes pipe fittings bends minimum wall thicknesses《通风设备 Ⅰ型聚丙烯(PP)垂直管道 弯管配件 最小壁厚》.pdf

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JB T 4303-1995 冷暖通风设备术语.pdf

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