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

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

A diesel engine piston ring face is in direct contact with the （）.

Lube oil cannot be efficiently filtered if its （）.

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

An automated diesel engine should normally shut down due to （）

In a simple mechanical governor, the （）.

If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.

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

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?（）