如图所示将一只小门铃放在密闭的玻璃罩内接通电路可清楚地听到铃声若用抽气机抽掉玻璃罩内的空气则铃声将会逐渐变小逐渐变小这个实验说明 Template




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tomski如图所示将一只小门铃放在密闭的玻璃罩内接通电路可清楚地听到铃声若用抽气机抽掉玻璃罩内的空气则铃声将会逐渐变小逐渐变小这个实验说明 coloring