990415topic today:mental addition of 2-digit numbers g4四
characteristics 特点 screen type: 屏幕类型: digital 数字 number
calculator 8 digit 3 key memory battery/solar power 103x31x145mm
digit2number英n#652mb#601美n#652mb#602,数字算术编号计入3figure
lcd, digital 液晶显示 number of lines/digits: 行/数字: 4
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