[Solved] The causes of non relevant indications are:

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Q.	The causes of non relevant indications are:
A.	Insufficient removal of excess surface penetrant
B.	Penetrant on operators hands
C.	Threads, keyways, splines, sharp corners, press fits, blind holes, rough surfaces
D.	Contaminated work surfaces
Answer» C. Threads, keyways, splines, sharp corners, press fits, blind holes, rough surfaces

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