During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.<br>A:ensure penetration and distribution of the fuel in the combustion chamber<br>B:ensure the needle valve is flushed clean during each injection<br>C:prevent combustion gas blowback into the open needle valve<br>D:prevent reflected pressure waves when the needle valve closes

During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.
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

出自：海船船员证

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