The lubricating pipes and dusts should be blown out with （）.

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

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

[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]Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.A . excessive crankcase pressureB . excessive lube oil temperatureC . contamination of the lube oil by waterD . contamination of the cooling

[单选题]F．or what purpose are the diving pipes used?A． To absorb heat from the sun.B． To store heat for future use.C． To turn solar energy into heat energy.D． To carry heat down below the surface.

[名词解释] 管道防腐（corrosion preventive of pipes）

[单选题]With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to （）.A . allow filtration of less viscous oilB . decrease the pressure drop across the filterC . improve overall filtrationD

[单选题]The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in （） while that for latter one is （）.A . sufficient quantity； measuredB . measured quantity；sufficientC . excessive quantity；suff

[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