Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.
1、Modern marine diesel engines equipped
Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is（）Aentirely constant...
2、In large marine diesel engines cylinde
In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.AinefficiencyBoilinessCdetergencyDpurity
3、One method of constructing large marin
One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.Acasting interlocking components...
4、Marine four-stroke diesel engines are
Marine four-stroke diesel engines are mainly （）.Aof crosshead typeBof trunk piston typeCof low speed typeDall the above
5、The marine diesel engine is a type of
The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.AprincipleBprincipalCcauseDcase
6、Before a marine diesel engine is start
Before a marine diesel engine is started the cylinders and pistons must be （）.Acooled to appropriate temperatureBwarmed up gradually to appropriate temperatureCopened up and renewedDground and polished