Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as（）

A.Each engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operation
B.propulsion engines with bores exceeding 200 mm are to be fitted with a means to display the cooling water temperature of each cylinder
C.At least two independent sea suctions are to be provided for supplying water to the engine jackets or to the heat exchangers
D.Suitable strain are to be fitted between the circulating pumps and heat exchangers when sea water is used for direct cooling

A.a clogged filter element
B.excessive lube oil pump discharge pressure
C.excessive lube oil flow
D.excessively hot lube oil

A.improper venting of the cooling system
B.carrying the expansion tank water level too high
C.a totally clogged impeller in the cooling water pump
D.an incorrectly set cooling system temperature control