气门重叠角=()
A:进气提前角+排气迟闭角+排气提前角
B:排气提前角+进气迟闭角+进气提前角 
C:进气提前角+进气迟闭角+排气迟闭角
D:排气提前角+排气迟闭角+进气提前角+进气迟闭角
出自:汽车性能试验工