设某发动机的进气提前角为α，进气迟关角为β，排气提前角为γ，排气迟关角δ则该发动机的进排、气门重叠角为α

设某发动机的进气提前角为α，进气迟关角为β，排气提前角为γ，排气迟关角δ则该发动机的进排、气门重叠角为α
A.α+δ
B.α+γ
C.β+γ
D.β+δ
正确答案：A