A diesel engine piston ring face is in direct contact with the （）.

Proper filtering and straining of fuel oil is important because the （）.

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

Maximum horsepower of a diesel engine is attained （）.

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

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

Diesel engine control can be obtained by the bridge （）.

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

How many power strokes per crankshaft revolution are there in an eight cylinder, two stroke/cycle diesel engine?（）

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