液体浮沉的小实验

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  ① a grape 一粒葡萄
  ② a jar of of water 一碗水
  ③ a cup of syrup 一小杯糖浆
  ④ a bottle of cooking oil 一瓶食用油
  ⑤ a plastic block一块塑料积木
  ⑥ a cork 一块软木
  ⑦ a tall transparent container 透明的高容器
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