In a simple mechanical governor, the （）.

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 （）.

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

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

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 （）.

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

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

When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.