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

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

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

Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse from the （）.

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

The highest pressure in a diesel engine cylinder normally occurs （）.

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

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

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

Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.