What is echo method?

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6. What is an echo study?
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Tags

1. #nondestructive
2. #propagate
3. #testing
4. #reflected
5. #impact
6. #waves
7. #structures
8. #based
9. #flaws
10. #internal
11. #surfaces
12. #generated
13. #masonry
14. #stress
15. #through
16. #concrete
17. #external
18. #sound
19. #method