单项选择题

Vessels required to be equipped with an approved backfire flame arrester are ______．
A.Those with diesel engines
B.All those with gasoline engines
C.Those with large engines only
D.None of the above

A.A.Those
B.All
C.Those
D.None
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单项选择题
What is an advantage of diesel over steam turbine propulsion ________．A.Less fuel consumption per SHPB.Diesel fuel costs less than bunker C or its equivalentC.Less routine maintenance requiredD.Less weight per SHP
A.A.Less
B.Diesel
C.Less
D.Less
单项选择题
What is the purpose of the intake exhaust valves in a diesel engine ________．A.They regulate the combustion cycleB.They supply cooling waterC.They synchronize the ignition sparkD.They supply and regulate the lubricant flow
A.A.They
B.They
C.They
D.They
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