Which_of_the_following_gases_can_be_beneficial_in_imparting_certain_de – McqOptions

MCQOPTIONS

1.	Which_of_the_following_gases_can_be_beneficial_in_imparting_certain_desirable_qualities_to_the_castings?
A.	Oxygen
B.	Nitrogen
C.	Hydrogen
D.	Carbon monoxide
Answer» C. Hydrogen

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