If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.

Combustion knock occurring in a diesel engine can be caused by （）.

A diesel engine piston ring face is in direct contact with the （）.

The main purpose of the piston oil scraper rings is to （）.

Maximum horsepower of a diesel engine is attained （）.

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?（）

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

Routine monitoring of a diesel engine should include （）.

The ability of the governor to prevent fluctuations in engine speed is termed （）.

Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to （）.