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

The minimum speed an engine must attain before ignition can occur depends upon （）.

An automated diesel engine should normally shut down due to （）

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

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?（）

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

In a simple mechanical governor, the （）.

In using reduction gears to obtain efficient propeller speeds, （）.

If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.

Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.