单项选择题 Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.

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 （）.