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

Lube oil cannot be efficiently filtered if its （）.

In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.

What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）

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 （）.

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

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

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

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

In a simple mechanical governor, the （）.