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

Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）

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

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

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

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

The minimum speed an engine must attain before ignition can occur depends upon （）.

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

Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to （）.

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