A.保壓閥得電,排氣閥得電B.保壓閥得電,排氣閥失電C.保壓閥失電,排氣閥得電D.保壓閥失電,排氣閥失電
A.保壓閥失電,排氣閥失電B.保壓閥得電,排氣閥得電C.保壓閥失電,排氣閥得電D.保壓閥得電,排氣閥失電
A.40msB.30msC.20msD.10ms