?回声测深仪

echo depth recorder ==> 回声深度记录器 echo depth sounder ==> 回声测深仪,回音测深仪 echo depth sounding sonar ==> 回声测深声纳,回声测深仪,超波深度测定器,超声波深度测定器 ..

?回音测深仪

... Test for depth sounder 测深仪试验 echo depth sounder 回声测深仪 ; 回音测深仪 marine depth sounder 海洋回声测深仪 ...