自来水管的内半径是2cm管内水的流速是每秒20cm．一位同学打开水龙头洗手走时忘了关5分钟后被另一名同学�现才关上请你算一算大约浪费 Sketch Coloring Page

自来水管的内半径是2cm管内水的流速是每秒20cm．一位同学打开水龙头洗手走时忘了关5分钟后被另一名同学�现才关上请你算一算大约浪费 Template

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tomski自来水管的内半径是2cm管内水的流速是每秒20cm．一位同学打开水龙头洗手走时忘了关5分钟后被另一名同学�现才关上请你算一算大约浪费 coloring

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