Oxide layer formed on the non-ferrous metal surface after its annealin

1.	Oxide layer formed on the non-ferrous metal surface after its annealing is
A.	removed by acid pickling.
B.	hammered into the surface.
C.	removed with coarse emery cloth.
D.	left as such to protect the surface.
Answer» B. hammered into the surface.

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Oxide layer formed on the non-ferrous metal surface after its annealing is

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