【名词&注释】
污水处理(wastewater treatment)、燃烧室(combustion chamber)、喷油器(injector)、四冲程柴油机(four-stroke diesel engine)、人工呼吸(artificial respiration)
[单选题]If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the
A. cylinder compression pressure may not be high enough
B. cylinder compression temperature may be too high
C. fuel oil injection pressure may not be high enough
D. scavenge and purge process is incomplete