A3纸的尺寸是29.7厘米×42厘米。 a4纸的尺寸是21厘米×29.7厘米。 b3纸的尺寸是35.3厘米×50.0厘米，通常用于印刷品。 b4纸的尺寸是25.7厘米×35.3厘米。 b5纸的尺寸.
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