The fuel pipes and ducts should be blown with （）.

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

[单选题]Fuel injection valves should be taken out, cleaned, and lifting checked every （）.A . two to four monthsB . four to six monthsC . six to eight month

[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]The electric fan has blown away the terrible smell in the hall, ______?A.ca

[单选题]Fuel injection systems meter fuel, atomize fuel, and （）.A . create turbulence in the combustion chamberB . aid in completing cylinder scavengingC . inject fuel at the proper timeD . minimize fuel penetration into the cylinder

[单选题]During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.A . ensure penetration and distribution of the fuel in the combustion chamberB . ensure the needle valve is flushed clean during each injectionC . prevent combust

[单选题]Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.A . cold corrosion of the nozzlesB . fuel viscosity for better atomizationC . carbon accumulation on the nozzlesD . fuel detonation in the cylinder

[单选题]Pipes made of this plastic are now widely used in building as they are ligh