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1 风管采用法兰连接时,风管法兰材料规格应按本标准表6.3.1选用,其螺栓孔的间距不得大于150mm,矩形风管法兰四角处应设有螺孔;gurixxemsjxotxfwlsclqxlzhneasdiwv 表6.3.1 风管法兰及螺栓规格vnvcrnhxbdohojbvlrwjj
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