**标准信封规格: 3号封 170mm x 125mm 5号封 220mm x 110mm 6号封 130mm x 240mm 7号封 230mm x 240mm 9号封 324mm x 229mm
国际标准信封规格: c0 917mm x 1297mm c1 648mm x 917mm c3 458mm x 648mm c4 229x 324mm c5 162mm x 229mm c6 114mm x 162mm c7 81mm x 114mm dl 110mm x 220mm c7/6 81mm x 162mm b4 250mm x 353mm b5 76mm x 250mm b6/c4 125mm x 324mm b6 125mm x 176mm 20210311