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Q. |
Typical frequencies which might be used to perform ultrasonic testing of concrete are: |
A. | 25 to 100 kHz |
B. | 200 kHz to 5 MHz |
C. | 1 MHz to 5 MHz |
D. | 2.25 MHz to 10 MHz |
Answer» A. 25 to 100 kHz |
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