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1 、. 2 、. 3 、. 4 、. 5 、. 6 、. 7 、. 8 、. 9 、. 10 、. 11 、、有一种游标卡尺，它的主尺最小分度是 1mm ，游标尺上有 50 个等分刻度，此游标尺的总长度是 ______mm ，用这种游标卡尺测长度时可以准确到 ______mm ，用此尺测铁球直径时，游标尺零刻度线在 2.2cm 到 2.3cm 两刻度线之间，游标尺的第 19 条刻度线与主尺上某条刻度线对齐，则此球的直径为 ______cm 。.

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  7. 11、、有一种游标卡尺，它的主尺最小分度是1mm，游标尺上有50个等分刻度，此游标尺的总长度是______mm，用这种游标卡尺测长度时可以准确到______mm，用此尺测铁球直径时，游标尺零刻度线在2.2cm到2.3cm两刻度线之间，游标尺的第19条刻度线与主尺上某条刻度线对齐，则此球的直径为______cm。

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