单项选择题
A.increasing the volume of intake air
B.shutting off the fuel supply
C.increasing the engine back pressure
D.over-speeding the engine
单项选择题 When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）
单项选择题 If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.
单项选择题 Routine monitoring of a diesel engine should include （）.