_________ of P/M parts is carried out to add holes, threads, undercuts, grooves.

_________ of P/M parts is carried out to add holes, threads, undercut

1.	_________ of P/M parts is carried out to add holes, threads, undercuts, grooves.
A.	Joining
B.	Plating
C.	Machining
D.	Impregnation
Answer» D. Impregnation