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

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

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

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

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

White smoke exhausting from an operating diesel engine may indicate （）.

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

Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.

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

What is the function of the thrust bearing?（）