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katrin2010 [14]
3 years ago
7

Which of the following statements is true?

History
2 answers:
Archy [21]3 years ago
7 0

Answer:

None of the above.

Explanation:

The Decca system was discontinued in 2001. Loran-C replaced the Decca navigation system which was more accurate. Loran-C uses low frequency radio waves.

SONAR (sound navigation ranging) was developed in World War I for threats like submarines.

Seismic profiling uses frequencies lower than 3 to 30 Hz which is not considered as high frequency.

inysia [295]3 years ago
7 0

Answer:

none of the above

Explanation:

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