某测量�是这样利用回声来测距离的他站在两座平直峭壁间的某一位置鸣枪并利用秒表记录了听到回声的时间他�现在经过了1s后听到了第一次回声又 Template




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tomski某测量�是这样利用回声来测距离的他站在两座平直峭壁间的某一位置鸣枪并利用秒表记录了听到回声的时间他�现在经过了1s后听到了第一次回声又 coloring