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ECM... (can/cannot) be used for all such materials for which ultrasonic machining is possible, while EDM... (can/cannot) be used for all such materials for which ECM is possible.
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- cannot
- can / can
- cannot / can
- cannot / cannot
Correct Option: C
Cannot, can. Ultrasonic machining can be done on any material but ECM and EDM can be done for conductive material.
