33. In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low-alloy steels because __________.

the beveled edges of the intake valves provide for self-centering during seating
intake valves utilize stellite-coated valve seat inserts which reduce wear
the effective volume of air passing through intake valves is less than the effective volume of air passing through exhaust valves
intake valves are not affected by the corrosive action of exhaust gases

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