声音在海水中的传播速度是1530ms.为了开辟新航道某�学探测船装有回声探测仪器探测水下有无暗礁探测船�出的声音信号经06s被接受到 Template




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tomski声音在海水中的传播速度是1530ms.为了开辟新航道某�学探测船装有回声探测仪器探测水下有无暗礁探测船�出的声音信号经06s被接受到 coloring