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

In using reduction gears to obtain efficient propeller speeds, （）.

The highest pressure in a diesel engine cylinder normally occurs （）.

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

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?（）

Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.

Routine monitoring of a diesel engine should include （）.

A thrust bearing is used with a propulsion diesel engine to （）.

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

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