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

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

To determine if the lube oil filter elements need changing, （）.

The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing workThis is known as （）.

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

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

For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.

What is the function of the thrust bearing?（）

A thrust bearing is used with a propulsion diesel engine to （）.

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