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比例尺,图上距离:实际距离,=50cm:40m,=50cm:4000cm,=1:80,30000000cm=300km,300,6cm,图上距离:实际距离,=6cm:1800m,=6cm:180000cm,=6:180000,=1:30000,图上距离:实际距离,2.5cm,=2.5cm:5mm,=2.5cm:0.5cm,=25:5,=5:1,再见,