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                 国 内 信 封 标 准
                代号     长(mm)     宽(mm)    备注
                B6号    176                   125             与现行3号信封①一致
                DL号    220                   110             与现行5号信封一致
                ZL号    230                   120              与现行6号信封一致
                C5号    229                   162             与现行7号信封一致
                C4号    324                    229            与现行9号信封一致


                 
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