There should be a lubricating oil （） between the main beatings and the crankshaft.

[单选题]Lubricating oil should be changed on a heavy duty diesel engine when（）.A . it gets dark in colorB . a sample rubbed between fingers feels thinC . it has been in use for a specified intervalD . it no longer supports combustio

[单选题]The function of a lubricating oil is （） to lubricate the running surface （） to carry away a great deal of heat.A . not；butB . neither；norC . either；orD . not only；but also

[单选题]Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an _____.A．over-speed tripB．audible/visual alarmC．the ships/boats general alarmD．reserve oil storage tank

[单选题]The remaining oil in the lubricating pipes and ducts should be blown out with （）.A . atmosphereB . the fresh waterC . compressed airD . chemical compound

[单选题]The selection of a lubricating oil depends to a great extent on the operating conditions,（）.A . the type of coolantB . the design of the engineC . the type of fuel to be burnedD . B and C

[单选题]The amount of lubricating oil in the drain tank should be checked by （）.A . measuringB . sounding rodC . meteringD . weighting

[单选题]Lubricating oil for an engine is stored at the bottom of the （）, known as the sump or in a drain tank located beneath the engine.A . sea cheatB . air receiverC . crankcaseD . water box

[单选题]In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.A . additivesB . waterC . greaseD . acid solutio

[单选题]Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by （）.A . internal crankshaft passagesB . immersion in oilC . splash lubricationD . injection lubricatio

[单选题]Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an （）.A . overspeed tripB . audible/visual alarmC . the ships/boats general alarmD . reserve oil storage tank