A combination of corrosion and erosion caused wastage in the main ballast line，which directly led to the leak ______．A.draffB.wastageC.mullockD.obsolete
A combination of corrosion and erosion caused wastage in the main ballast line，which directly led to the leak ______．
A.draff
B.wastage
C.mullock
D.obsolete
相关考题：
If an auxiliary diesel engine coolant temperature is higher than normal, but the thermostat is determined not to be defective, you would suspect a/anA.cavitation erosion in the water jacketsB.excess corrosion inhibitor in the coolantC.dirty jacket water coolerD.defective turbocharger
While sailing in ballast under normal weather and sea condition, the basic parameter which is used to restrict the fuel injection of main engine isA.the exhaust temperatureB.the speed of main engineC.the turbine rotation speedD.the power of main engine
A segregated ballast system is a system whereA.all ballast is processed through the oily water separatorB.ballast is taken on and discharged through a separate main deckC.ballast and cargo tanks are separated by cofferdamsD.all ballast lines, tanks, and pumps are independent of those used for oil
The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to______.A.precipitate(使沉淀) silica （硅石）from solutionB.reduce corrosion in the heating coilC.prevent clogging and erosion in the coilD.maintain zero water hardness
A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.A.corrosion at low engine loadsB.erosion at high engine loadsC.overload at high engine loadsD.scaling at all exhaust temperatures
Which of the problems listed could cause erosion of the expansion valve disks and seats?A.Overcharging the system with refrigerantB.Faulty compressor suction valveC.Failure of the high pressure cutoutD.Flash gas formed in the liquid line
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！
Chafing gear ______.A.reduces and prevents corrosion of standing riggingB.prevents corrosion of running riggingC.reduces and prevents wear caused by the rubbing of one object against anotherD.protects the body against extreme cold
Given the following code： 1） class Parent { 2） private String name； 3） public Parent（）{} 4） } 5） public class Child extends Parent { 6） private String department； 7） public Child（） {} 8） public String getValue（）{ return name； } 9） public static void main（String arg[]） { 10） Parent p = new Parent（）； 11） } 12） } Which line will cause error？（） A、 line 3B、 line 6C、 line 7D、 line 8E、 line 10
Which is the earliest line in the following code after which the object created on the line marked （0） will be a candidate for being garbage collected， assuming no compiler optimizations are done？ （） public class Q76a9 { static String f（） { String a = "hello"； String b = "bye"； // （0） String c = b + "!"； // （1） String d = b； b = a； // （2） d = a； // （3） return c； // （4） } public static void main（String args[]） { String msg = f（）； System.out.println（msg）； // （5） } } A、The line marked （1）.B、The line marked （2）.C、The line marked （3）.D、The line marked （4）.E、The line marked （5）.
单选题Corrosion and grooving on the blade of an exhaust driven turbocharger is caused by certain components of residual fuel oilsThese components are vanadium,sodium, and（）AcopperBcarbonChydrogenDsulfur
单选题The main bearing shells often have a thin （） of lead or indium to provide a layer giving protection against corrosion.AflangeBflashCplateDsheet
单选题You are working on a debug build of an application.You need to find the line of code that caused an exception to be thrown. Which property of the Exception class should you use to achieve this goal？（）ADataBMessageCStack TraceDSource
单选题A segregated ballast system is a system where （）Aall ballast is processed through the oily water separatorBballast is taken on and discharged through a separate main deck riserCballast and cargo tanks are separated by cofferdamsDall ballast lines, tanks, and pumps are independent of those used for oil
单选题Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）ALube oil passing through the systemBMoisture or foreign matter collecting at the valve seat and orificeCVariable spring tension caused by the changing temperatureDFrost on the liquid line
单选题Chafing gear（）.Areduces and prevents corrosion of standing riggingBprevents corrosion of running riggingCreduces and prevents wear caused by the rubbing of one object against anotherDprotects the body against extreme cold
单选题The main engine is cooled with fresh water （）is added suitable small quantities of chemicals to prevent corrosion.Ain whichBon whichCto whichDby which
单选题Fighting a rig fire in the ballast pumproom with hoses would adversely affect the stability of the rig most by（）.Aincreasing the permeability of the pumproomBreduction of drill water from the storage tanksCa list caused by water filling the compartmentDa reduced KG caused by water filling the compartment
单选题Exhaust valve grooving and corrosion is caused by certain components of residual fuel oilThese components are sodium, sulfur, and （）.AvanadiumBcarbonCcopperDash
单选题If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）Acavitation erosion in the water jacketsBexcess corrosion inhibitor in the coolantCdirty jacket water coolerDdefective turbocharger
单选题The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to（）Aprecipitate silica from solutionBreduce corrosion in the heating coilCprevent clogging and erosion in the coilDmaintain zero water hardness
单选题Which is the earliest line in the following code after which the object created on the line marked （0） will be a candidate for being garbage collected， assuming no compiler optimizations are done？ （） public class Q76a9 { static String f（） { String a = "hello"； String b = "bye"； // （0） String c = b + "!"； // （1） String d = b； b = a； // （2） d = a； // （3） return c； // （4） } public static void main（String args[]） { String msg = f（）； System.out.println（msg）； // （5） } }AThe line marked （1）.BThe line marked （2）.CThe line marked （3）.DThe line marked （4）.EThe line marked （5）.
单选题Where tanks are arranged for either oil or ballast （） must be fitted in the pipe so that only the ballast main or the oil transfer main connected to the tank.Aa sea water chestBa change-over chestCa buffer tankDa three-way valve
单选题The presence of bubbles in a refrigeration system liquid line may （）.Apromote refrigerant dehydrationBbe absorbed in the receiverCcause low condensing pressureDcarry moisture and lead to corrosion
单选题Which measure should NOT be taken to reduce the pounding of a vessel in a head sea?（）AAdd ballast in the afterpeakBAdd ballast forwardCAlter courseDReduce speed