Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）

Lubricating systems for diesel engines are usually designed to initially provide

[单选题]Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）A . camshaft beatingsB . main bearingsC . piston crownsD . cylinder wall

[单选题]If you are unable to stop a diesel engine by any other means，you should（）.A . discharge a CO2 extinguisher in the air inletB . pull off the distributor capC . secure the jacket waterD . secure the starting air supply valve

[单选题]Directional intake ports in diesel engines are used to （）.A . reduce air charge turbulenceB . induce air swirlC . deflect hot combustion gas away from the valvesD . oppose the effects of piston induced squish

[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]For an ordinary four-stroke diesel engine the exhaust valves close （）.A . after TDCB . before TDCC . after BDCD . before BDC

[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]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

[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]There should be a lubricating oil （） between the main beatings and the crankshaft.A . filmB . capC . lacquerD . shell