二、跷跷板的变化

YiLin Yuanchuang ban - - 智商黑洞 -

装了一半沙子的桶子,下面放上铁垫,和里面装满水的桶子,分别放在跷跷板的左右两端保持平衡。如果把桶子下面的铁垫放入水中,会有何变化?

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