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

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

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 （）.

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

What is the function of the thrust bearing?（）

When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）

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

Routine monitoring of a diesel engine should include （）.

The function of diesel engine piston compression rings is to （）.