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並前往https://www.quora.com/Why-are-printing-paper-sizes-standard-exactly-E-g-A4-measures-210-297-millimeters-or-8-27-11-69-inches-Can-be-round-off-like-210-x-300-mm-or-8-30-x-11-70

Why are printing paper sizes standard exactly. E.g. A4 ... - Quora

“letter” size was 1/16 of a full papermaker's sheet Things changed a bit with ... While nominally 210 × 297 mm, the tolerance is ±2 mm for the ISO paper ...

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