单选题Surface irregularities, such as erosion and pitting on injection pump plungers, will（）Aincrease ignition delayBaffect fuel oil meteringCaffect engine performance at low speedDonly disappear due to fuel oil abrasion
单选题
Surface irregularities, such as erosion and pitting on injection pump plungers, will（）
A
increase ignition delay
B
affect fuel oil metering
C
affect engine performance at low speed
D
only disappear due to fuel oil abrasion
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____ is covered with heavy snow. A.The earth's surfaceB.The surface of earthC.The surface earthD.The earth surface
材料：Spark erosion is caused by a voltage discharge between the main bearing and journal surface. The cause of the potential is the development of a galvanic element between the ship’s hull, sea water, and the propeller shaft/crankshaft.The oil film acts as a dielectric. The puncture voltage in the bearing depends on the thickness of the oil film. With increasing engine ratings, the specific load in the main bearing is increased. his will reduce the oil film thickness, and enable the discharge to take place at a lower voltage level.Since the hydrodynamic oil film thickness varies through a rotation cycle, the discharge will take place at roughly the same instant during each rotation cycle, i.e. when the film thickness is at its minimum. The roughening will accordingly be concentrated in certain areas on the journal surface. In the early stages, the roughened areas can resemble pitting erosion. but later, as the roughness increases, the small craters will scrape off and pick up white metal-hence the silvery white appearance.Therefore, to ensure protection against spark erosion, the potential level must be kept at maximum 80 mV, which is feasible today with a high efficiency earthing device. If an earthing device is installed, its effectiveness must be checked regularly. Spark erosion is only observed in main bearings and main bearing journals.问题：According to the paragraph one, a voltage between the main bearing and journal surface is produced by______.A.propeller rotationB.leakage from M/E electric control unitC.a galvanic elementD.friction between the main bearing and journal surface______engine ratings increase, the hydrodynamic oil film between the main bearing and journal surface is______.A.The lower/thinnerB.The higher/the thickerC.The lower/thickerD.The higher/thinnerWhen will the spark erosion take place on the journal surface during each rotation cycle?A.when the film thickness is at its minimumB.when the film thickness is at its maximumC.when the engine is on its compression strokeD.when the engine is on its exhaust strokeDuring the engine room watch keeping, which equipment must be noted to ensure protection against spark erosion?A.the antifouling plantB.the earthing deviceC.the main engine electric heating coilsD.the shaft generator请帮忙给出每个问题的正确答案和分析，谢谢！
______ may not justify detention．A.significant areas of damage or corrosionB.pitting of plating and associated stiffening in decksC.pitting of hull affecting seaworthiness or strength to take local loadsD.the condition of such items as ladder ways，guard-rails，pipe coverings
A combination of corrosion and erosion caused wastage in the main ballast line，which directly led to the leak ______．A.draffB.wastageC.mullockD.obsolete
The correction to KG for longitudinal free surface effects for a vessel can be found by dividing the vessel's displacement into the ______．A.Transverse free surface correction for the vesselB.Sum of the vertical moments of the vesselC.Sum of the longitudinal free surface moments of the vesselD.Longitudinal centerline of the vessel
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单选题To calculate the free surface correction，it is necessary to divide the free-surface moments by the（）.Atotal weight of liquid loadsBtotal displacementClightweightDdeadweight
单选题The correction to KG for longitudinal free surface effects for a vessel can be found by dividing the vessel’s displacement into the（）.Atransverse free surface correction for the vesselBsum of the vertical moments of the vesselCsum of the longitudinal free surface moments of the vesselDlongitudinal centerline of the vessel
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