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 （）.

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

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

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

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

In a simple mechanical governor, the （）.

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

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

What is the function of the thrust bearing?（）