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

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?（）

For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.

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

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

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

Maximum horsepower of a diesel engine is attained （）.

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

The ability of the governor to prevent fluctuations in engine speed is termed （）.

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