Because of the high loads the bearing material is a tin-aluminum(锡-铝) alloy bonded to a steel shell. The crosshead pin is highly polished to a______.A.flat surfaceB.mirror finishC.sloping(倾斜的) surfaceD.inclined(倾向的) surface
Because of the high loads the bearing material is a tin-aluminum(锡-铝) alloy bonded to a steel shell. The crosshead pin is highly polished to a______.
A.flat surface
B.mirror finish
C.sloping(倾斜的) surface
D.inclined(倾向的) surface
相关考题：
The machine has stopped rotating because the bearing _____ the shaft.A.seizedB.cloggedC.meltedD.inserted
Our clients asked us to bring down our prices because they consider them（）.A、on the high sideB、out of line withC、are running highD、be too high
单选题What is NOT used as a stern tube bearing，on a large vessel? （）AWooden (lignum vitae) stripsBHard rubberCResin bonded compositionDBronze bushings
单选题Pistons may be made in （） in order to keep the weight down for balancing purposes at high speed.Acast ironBforged steelCstainless steelDaluminum alloy
单选题In the management of the shafting, because（） carry heavy load and caused high temperature easily, it should be paid attention.Athe bearing near to the diesel engineBthe intermediate bearing near to the thrust bearingCthe intermediate bearing near to the sterntubeDthe bearing located at the middle of the diesel engine and the sterntube
单选题An exhaust gas bypass is installed on a waste heat boiler in order to （）.Abypass exhaust gas at high loads to prevent excessive back pressureBbypass a portion of the exhaust gas at peak loads for better efficiencyCrecycle exhaust gas to the turbochargerDminimize moisture condensation in the boiler gas passages at low loads
单选题The purpose of an oil mist detector in a main propulsion diesel engine is to warn of （）Aexcessive mist density in the crankcasesBexcessively high crankcase vacuumCexcessively high bearing temperatureDexcessive carbon buildup in the lube oil
单选题A semiconductor is a material with a （）.Aconductivity higher than a normal conductorBconductivity higher than a normal insulatorChigh conductivity at low temperaturesDlow conductivity at high temperatures
单选题When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by （）Aoverloading the engineBlow exhaust valve liftCexcessive cylinder coolingDinsufficient mechanical clearance
单选题Burning fuel with a high sulfur content in a diesel engine will （）Aincrease thermal efficiencyBcause clogging of the fuel systemCincrease the ability of the engine to start in cold weatherDproduce corrosion in the cylinder and exhaust system at low loads
单选题For a fire to begin there must be present a combustible material, oxygen or air to （）combustion, and a source of heat at a temperature high enough to start combustion.AbeginBsupportClastDextinguish
单选题A diesel engine should not be operated at low loads for long periods of time because（）Aheavy carbon deposits will buildup on the valves and in the exhaustBfuel dilution is increased at low loadCexhaust valves may be damagedDall of the above
单选题The operator of electrical motors should keep a constant check on the loads they carry because （）Alow loads necessitate frequent insulation cleaningBexceeding nameplate values shortens useful lifeCenergy is wasted if full loading is not utilizedDpower factor correction methods are load dependent
单选题Because of the high loads the bearing material is a tin- aluminum alloy bonded to a steel shellThe crosshead pin is highly polished to a （）.Aflat surfaceBmirror finishCsloping surfaceDinclined surface
单选题The main bearing shells are made of steel with a lining of bearing metal which may be white metal, copper-lead or aluminum-tin alloy What is the meaning of “which” in the sentence above?（）Amain bearing shellsBmain bearingCsteelDbearing metal
单选题The main bearings are provided with thin-walled （）, lined with a copper-lead alloy.Asteel guidesBsteel shellsCsteel bearing capsDpig iron
单选题High lube oil temperatures developing in a diesel engine can result from（）Ahigh oil pressureBexcessive bearing end playCplugged oil control ringsDengine overload
单选题Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.AleadBforged steelCalloy steelDaluminum alloy