Прочитайте текст и заполните пропуски подходящими по смыслу словами Sonar Sound Navigation and Rangi...: ответ на тест 606853 - Английский язык

Прочитайте текст и заполните пропуски подходящими по смыслу словами
Sonar (Sound Navigation and Ranging) is employed to locate submerged enemy 1________________. Like radar it is an echo-ranging 2__________________. It operates in the following way - a ship 3________________ a sound wave into the water. Encounting an obstacle the wave is reflected back to the ship, which – since the speed of sound through water is known - determines its distance from the object from the time it took the echo to return. To create the original sound wave, the ship generates 4________________ signals in а transmitter; it then sends these to a transducer, positioned on its keel as deeply in the water as possible. The transducer converts the signals into sound and transmits them through the water.