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Which of the following techniques are not applicable for detecting internal flows in a ceramic material?
1. Liquid penetration test
2. Radiography
3. Ultrasonic testing
4. Eddy current method

Which of the following techniques are not applicable for detecting internal flows in a ceramic material?
1. Liquid penetration test
2. Radiography
3. Ultrasonic testing
4. Eddy current method Correct Answer 1 and 4

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