C sizes: series of sizes for envelopes in the isO range. To accommodate stationery in a series sizes.
度：国际标准范围内的信封尺寸系列：以容纳A度系列的书信文件。
C sizes: series of sizes for envelopes in the ISO range. To accommodate stationery in a series sizes.
c度：国际标准范围内的信封尺寸系列：以容纳A度系列的书信文件。
C sizes: series of sizes for envelopes in the ISO range. To accommodate stationery in a series sizes.
c度：国际标准范围内的信封尺寸系列：以容纳A度系列的书信文件。
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