A、the inlet valve is open
B、the exhaust valve is open
C、both valves are close
D、both valves are open
更多“The period of valve overlap is when （）.”相关的问题
A、closing later B、opening sooner C、staying open for a shorter period of time D、staying open for a longer period of time
A、Holding the valve open for a long period B、Increasing the starting air pressure used C、Opening the stating air valve quickly D、Reducing the starting air valve size
A、the period of darkness exceeds the period of light B、there is only a partial eclipse of the light C、the periods of light and darkness are equal D、the period of light exceeds the period of darkness
A、the period of darkness exceeds the period of light B、there is only a partial eclipse of the light C、the periods of light and darkness are equal D、the period of light exceeds the period of darkness
A、the inlet valve is open B、the exhaust valve is open C、both valves are closed D、both valves are open
A、increase back pressure during the exhaust process B、facilitate periodic replacement of the valves C、reduce the pumping loss associated with scavenging D、reduce tension on valve springs
A、ensure penetration and distribution of the fuel in the combustion chamber B、ensure the needle valve is flushed clean during each injection C、prevent combustion gas blowback into the open needle valve D、prevent reflected pressure waves when the needle valve closes
A、heavy carbon deposits will buildup on the valves and in the exhaust B、fuel dilution is increased at low load C、exhaust valves may be damaged D、all of the above
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