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单选题
"Cast iron has poor corrosion resistance to sea water, especially in the presence of bronzes" Implies（）.
A
east iron is a cheap material
B
cast iron can pollute sea water
C
cast iron has mere corrosive than bronzes to sea water
D
cast iron is more corrosive to sea water when it meets with bronzes
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更多 “单选题"Cast iron has poor corrosion resistance to sea water, especially in the presence of bronzes" Implies（）.A east iron is a cheap materialB cast iron can pollute sea waterC cast iron has mere corrosive than bronzes to sea waterD cast iron is more corrosive to sea water when it meets with bronzes” 相关考题
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What is the most usual reason for the fresh water-sea water heat exchanger fouling in the sea side?A.lube oil sludge accumulating in itB.dirt and scale etc , formed on the surfacesC.deformation of the tubes and the shell or the platesD.lube oil leakage into sea-water side
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共用题干
1.Certainly no creature in the sea is odder than the common sea cucumber. All living creatures,especially human beings,have their peculiarities,but everything about the little sea cucumber seems unusual.What else can be said about a bizarre animal that,among other eccentricities, eats mud,feeds almost continuously day and night but can live without eating for long periods,and can be poisonous but is considered supremely edible by gourmets?2.For some fifty million years,despite all its eccentricities,the sea cucumber has subsisted on its diet of mud.It is adaptable enough to live attached to rocks by its tube feet,under rocks in shallow water,or on the surface of mud flats.Common in cool water on both Atlantic and Pacific shores, it has the ability to suck up mud or sand and digest whatever nutrients are present.3.Sea cucumbers come in a variety of colors,ranging from black to reddish brown to sand color and nearly white.One form even has vivid purple tentacles.Usually the creatures are cucumber shaped一hence their name一and because they are typically rock inhabitants,this shape,combined with flexibility,enables them to squeeze into crevices where they are safe from predators and ocean currents.4.Although they have voracious appetites,eating day and night,sea cucumbers have the capacity to become quiescent and live at a low metabolic rate feeding sparingly or not at all for long periods,so that the marine organisms that provide their food have a chance to multiply.If it were not for this faculty,they would devour all the food available in a short time and would probably starve themselves out of existence.5.But the most spectacular thing about the sea cucumber is the way it defends itself. Its major enemies are fish and crabs,when attacked,it squirts all its internal organs into water. It also casts off attached structures such as tentacles.The sea cucumber will eviscerate and regenerate itself if it is attacked or even touched;it will do the same if the surrounding water temperature is too high or if the water becomes too polluted.When attacked,sea cucumbers can cast off certain organs and______. A:extinctB:bizarreC:interestingD:inactive E:greedyF: reproduce
考题
Which of the following statements is TRUE according to the passage?___________A.Oceanic salinity has great effect on sea life
B.Many factors combine to cause changes in oceanic salinity
C.The movement of the water is related to the amount of salt
D.The temperature of the water has much to do with the oceanic salinity
考题
单选题The cast iron was melted and _____ into sand molds as soon as possible.A
regulatedB
relayedC
pouredD
oppressed
考题
单选题An advantage of aluminum pistons, when compared to cast iron pistons is （）.A
greater high temperature strengthB
better heat conductivityC
greater weight per cubic inchD
increased resistance to wear
考题
单选题The bosun has thrown the liferaft into the water before abandoning the vessel. The operating cord（）.A
serves as a sea painterB
detaches from the liferaft automaticallyC
is used to rig the boarding ladderD
is cut immediately as it is of no further use
考题
单选题The fresh water generator produces fresh water （）.A
by cooling sea waterB
by heating sea waterC
by evaporation of sea waterD
by purifying sea water
考题
单选题Aluminum pistons have （） coefficient of thermal expansion compared with those of cast iron.A
higherB
lowerC
the sameD
none of the above
考题
单选题Cast irons weakness in tension and under shock loading limits its use to low pressure steam, air, oil and low speed water fittingsThe above sentence, most probably means （）.A
cast iron has weaknessB
cast iron can stand up shock loadingC
cast iron fittings are only suitable in low pressure situationD
east iron fittings are not suitable in low pressure situation
考题
单选题Cast sea anchor to （）the speed of drifting raft.A
controlB
controllingC
controlledD
controls
考题
单选题What should you apply to a fathometer reading to determine the depth of water?（）A
Subtract the draft of the vesselB
Add the draft of the vesselC
Subtract the sea water correctionD
Add the sea water correction
考题
单选题In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.A
fresh waterB
sea waterC
cooling oilD
emulsion
考题
单选题With （）, the corrosion problems are much reduced in a central cooling system.A
no equipment in contact with sea waterB
less equipment in contact with fresh waterC
more equipment in contact with sea waterD
less equipment in contact with sea water
考题
单选题Wrought iron has an inherent resistance to corrosion but is not to be had freely , its place has been taken by the cuprous alloysAccording to the above sentence , which of the following statements is true?（）A
Wrought iron can resist liquids flowB
It is difficult to attain the wrought ironC
Wrought iron should be combined with cuprous alloysD
The cuprous alloys have mere disadvantages than wrought iron
考题
单选题（） of the A-frames there is a strong cast iron frame called the scavenging air box.A
At the topB
At the bottomC
In the topD
In the bottom
考题
单选题At the top of the A-frames there is a strong cast iron frame called （）.A
cylinder linerB
cylinder coverC
the gear boxD
the scavenging box
考题
单选题After stopping oily water separator, sea water should be permitted for （） minutes,（）should be closed after stopping pump to reduce oxidation corrosion of inner wall.A
15；inlet valueB
15；inlet and outlet valueC
30；inlet valueD
30；inlet and outlet value
考题
单选题In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）A
sea water temperature must never be warmer than 40℃B
jacket water pressure should always be greater than the sea water pressureC
jacket water temperature must always be less than 60℃D
jacket water pressure must always be less than the sea water pressure
考题
问答题New York has the Statue of Liberty, Paris has its Eiffel Tower and Copenhagen has this pretty, charming maiden who stars dreamily out across the water, just as her Danish countrymen have done for thousands of years. The Little Mermaid is just small enough and close enough to the water to be an excellent symbol of Copenhagen and Denmark. The sculpture stands 165 centimeters tall and weighs 175 kilograms. The original one, cast in bronze, was presented to the City of Copenhagen on August 23, 1913 by Carl Jacobsen.
考题
单选题On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as（）A
cooling jacketB
cylinder linerC
piston crownD
cylinder cover
考题
单选题Most conducting materials such as copper, aluminum, iron, nickel, and tungsten （）.A
increase in resistance with increased temperatureB
increase in resistance with decreased temperatureC
decrease in resistance with increased temperatureD
increase in conductance with increased temperature
考题
单选题Cast iron and gunmetal fittings are used freely in small sizes at moderate pressure; large fittings, those for high pressure and temperature are cast or mild steelIn the above sentence, the word “those” means （）.A
east iron firingsB
mild steel fittingsC
small fittingsD
large fittings
考题
单选题In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.A
main bearingsB
sea waterC
cooling oilD
lower temperature fresh water
考题
单选题An aluminum piston has lower inertia and higher coefficient of （） compared to that of cast iron.A
viscosityB
twisting momentsC
inertiaD
thermal expansion
考题
单选题Aluminum lifeboats are subject to damage by electrolytic corrosion (the aluminum being eaten away). In working around boats of aluminum you must be very careful（）.A
to keep the boats covered at all timesB
not to leave steel or iron tools lying in or near these boatsC
to keep an electric charge on the hull at all timesD
to rinse these boats regularly with salt water
考题
单选题Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）A
twice as large as with a cast iron pistonB
the same size as with a cast iron pistonC
half as large as with a cast iron pistonD
the same size as the crown of an aluminum piston
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