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向两个大小、形状相同的透明杯子中加入等量的水,标出水的高度。
496958322
2024-10-13 12:56:20
向两个大小、形状相同的透明杯子中加入等量的水,标出水的高度。用塑料薄膜盖好其中一个杯口,并用橡皮筋固定。另一个不盖。(如图)把它们放到通风和向阳的位置,静置。2~3天后,观察两个杯子中水量的变化。
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