A2、A3、A4、这个A几的纸是怎么分的?像这个21.528*27.937是A几的纸?
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![A2、A3、A4、这个A几的纸是怎么分的?像这个21.528*27.937是A几的纸?](/uploads/image/z/8700283-19-3.jpg?t=A2%E3%80%81A3%E3%80%81A4%E3%80%81%E8%BF%99%E4%B8%AAA%E5%87%A0%E7%9A%84%E7%BA%B8%E6%98%AF%E6%80%8E%E4%B9%88%E5%88%86%E7%9A%84%3F%E5%83%8F%E8%BF%99%E4%B8%AA21.528%2A27.937%E6%98%AFA%E5%87%A0%E7%9A%84%E7%BA%B8%3F)
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