国标管径DN15、DN20、DN25、DN32、DN40、DN50，内、外径尺寸是多少毫米_百度知道
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如果管道材料为混凝土及其他预制或是现场浇筑的材料，管壁较厚，此时就不能取外径和内径的平均作为管径值，此种情况，需要注明内径外径，不能模糊称为管径。
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