echo-sounder
柯林斯詞典
1. N a navigation and position-finding device that determines depth by measuring the time taken for a pulse of high-frequency sound to reach the sea bed or a submerged object and for the echo to return 廻聲測(cè)深儀
返回 echo-sounder
1. N a navigation and position-finding device that determines depth by measuring the time taken for a pulse of high-frequency sound to reach the sea bed or a submerged object and for the echo to return 廻聲測(cè)深儀