A.頂開吸氣閥 B.泄放排氣 C.截斷進氣 D.A或B
A.2.4~2.5 B.2.9~3.0 C.2.4~2.9 D.A和B
A.2.4~3.0 B.2.5~2.9 C.2.4~2.9 D.2.5~3.0