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

Lube oil cannot be efficiently filtered if its （）.

Maximum horsepower of a diesel engine is attained （）.

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

Combustion knock occurring in a diesel engine can be caused by （）.

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

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

In a simple mechanical governor, the （）.

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

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