单项选择题
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
单项选择题 Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.
单项选择题 High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.
单项选择题 On most diesel engines, the governor controls the output speed by （）.
