题目内容

Duringthefuelinjectionperiod,fuelpressuremustexceedcylindergaspressureto（）.

A. ensurepenetrationanddistributionofthefuelinthecombustionchamber
B. ensuretheneedlevalveisflushedcleanduringeachinjection
C. preventcombustiongasblowbackintotheopenneedlevalve
D. preventreflectedpressurewaveswhentheneedlevalvecloses

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