下列各项中，属于法律事实事件的是()。

A.Slow speed diesel engines

B.Medium-speed diesel engines

C.Steam engines

D.Gasoline engines

A.The direction of pressure on the journal in four-stroke engine is continuously

B.positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine

C.four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines

D.Low-stroke engines usually consume less lube oil than four-stroke engines

Which lubricating oil additive is used in diesel engines to reduce the tendency(倾向)for sludge and varnish to form on the engine parts？

A.Flash point improvers

B.Pour point improvers

C.Inhibitors

D.Foam suppressors(抑制物)

Lubrication for the main reduction gears used with diesel engines is usually supplied by

A.oil from the main engine sump

B.an independent lube oil system

C.the stern bearing head tank

D.the stem bearing sump tank

A.A common rail engine, conventional engines

B.A conventional engine, common rail engines

C.A marine diesel engine, most other engines

D.A two-stroke engine, four-stroke engines

A.Flash point improvers

B.Pour point improvers

C.Inhibitors

D.Foam suppressors

Within the gasoline or the diesel engine, about () of the energy is used to drive the vehicle.

A.25%

B.33%

C.9%

D.all of the above

A.bearing pressure in a four-stroke\cycle acting single diesel engine is continually reversed

B.bearing pressure in a two-stroke\cycle single acting diesel engine is continually reversed

C.the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine

D.two-stoke/cycle diesel engines require more complicated lubrication piping

A.the main engines

B.the auxiliary engines

C.the emergency generator engine

D.the auxiliary engines and the main engine(s)