单项选择题
A.Defective temperature controls in the system
B.Cavitation in the cooling water pump
C.Opened vent in the cooling system
D.Restricted water passages in the engine
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 （）.
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 （）.