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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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