Which of the listed design features is found in an exhaust valve and NOT in an intake valv

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Which of the listed design features is found in an exhaust valve and NOT in an intake valve?

A.Hard alloy steel construction

B.Beveled edges on the valve head

C.Low alloy steel construction

D.Poppet type design

请帮忙给出正确答案和分析,谢谢!

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