如图所示往保温瓶里灌开水的过程中听声音就能判断壶里水位高低这是因为a随着水位升高音调逐渐升高b随着水位升高音调逐渐降低c灌水过程 Template




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tomski如图所示往保温瓶里灌开水的过程中听声音就能判断壶里水位高低这是因为a随着水位升高音调逐渐升高b随着水位升高音调逐渐降低c灌水过程 coloring