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镀锌钢管该怎样选择?

发布日期:2019年1月28日 上午2:47

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4。矩形管的密度。另一种选择矩形管的方法是用手轻敲砖体,仔细分辨声音是否清脆悦耳,如果有金属声音质量,砖体密度高,烧结性好;如果声音粗糙沉闷,管体烧结度低,密度不高;如果轻敲平声嘶哑,矩形管属于劣质产品,管体甚至有裂纹。一般来说,手砖感觉沉重,密度高,硬度高,强度高,反之亦然,质地差。
镀锌钢管该怎样选择?




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