用声�可以探测海底深度声波在海水中的传播速度是1531ms从船底安装的声��海底垂直�出声波经12s后接收到反射波.1声��出的 Template




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tomski用声�可以探测海底深度声波在海水中的传播速度是1531ms从船底安装的声��海底垂直�出声波经12s后接收到反射波.1声��出的 coloring