阅读短文回答问题星系在远离�们而去当一列火车迎面驶来时�们听到的汽笛声音调会升高当它离�们远去时音调降低这一现象叫多普勒效应.光 Template




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tomski阅读短文回答问题星系在远离�们而去当一列火车迎面驶来时�们听到的汽笛声音调会升高当它离�们远去时音调降低这一现象叫多普勒效应.光 coloring