国标图纸标准为什么不凑整数？ - 知乎
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很简单，国标办公用纸（包括图纸）的尺寸是按照√2：1的比例确定的，这一比例天然决定了会有非整数的尺寸出现。 现行图纸国家标准主要是GB/T 148-1997《印刷、书写和绘图纸幅面尺寸》，这一标准与ISO 216:1975是非等效采用。 ISO 216这一标准来源于德国标准DIN 476，现在最新版本为ISO 216:2006（2016 ...
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