单项选择题

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