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单选题
In plugging submerged holes on a vessel，rags，wedges，and other materials should be used in conjunction with plugs to（）.
A
reduce the water pressure on the hull
B
reduce the water leaking around the plugs
C
prevent progressive flooding
D
reduce the possibility of stress fractures
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更多 “单选题In plugging submerged holes on a vessel，rags，wedges，and other materials should be used in conjunction with plugs to（）.A reduce the water pressure on the hullB reduce the water leaking around the plugsC prevent progressive floodingD reduce the possibility of stress fractures” 相关考题
考题
The maximum draft to which a vessel can legally be submerged is indicated by the ______.A.Loadline markB.Certificate of InspectionC.Station BillD.Tonnage mark
考题
A partly submerged vessel or object being towed，which is not readily noticeable，shall show ______.A.yellow lights at each endB.two red lights in a vertical lineC.a black ballD.a diamond shape
考题
A vessel aground would show the same dayshape as a ______.A.vessel towing a submerged objectB.dredge underway and dredgingC.hydrographic survey vessel at anchor and surveyingD.None of the above
考题
When patching holes in the hull of a ship，pillows，bedding，and other soft materials can be used as ______．A.caulkingB.gasketsC.strongbacksD.wedges
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共用题干
B1i'k Holes1 Black holes can be best described as a sort of vacuum,sucking up everything in space. Scientists have discovered that black holes come from an explosion of huge stars. Stars that are near death can no longer burn due to loss of fuel , and because its temperature can no longer control the gravitational（重力的）force, hydrogen ends up putting pressure onto the star' s surface until it suddenly explodes then collapses.2 Black holes come from stars that are made of hydrogen,other gases and a few metals. When these explode it can turn into a stellar-mass ( 恒星质量）black hole , which can only occur if the star is large enough (should be bigger than the sun) for the explosion to break it into pieces,and the gravity starts to compact every piece into the tiniest particle. Try to see and compare:if a star that' s ten times the size of the sun endsup being a black hole that' s no longer than 70 kilometers ,then the Earth would become a black hole that' sonly"fraction of an inch! 3 Objects that get sucked in a black hie will always remain there,never to brsak fren. But rememberthat black holes can only gobble up（吞噬）objects within a specific distance to it It' s possible for a largestar near the sun to become a black hole,but the sun will continue to stay in place. Orbits (轨道）do notchange because the newly formed black hole, contains exactly the same amount of mass as when it was a star,only this time its mass is totally contracted that it can end up as on biggeer tnan a state. 4 So far, astronomers have figured out that black holes exist because of Albert Einstenin's theory of relativity. In the end,through numerous studies ,they have discovered that black holes truly exist. Since blackholes trap light and do not give off light,it is nearly impossible to detect black goles via a telescope. Butastronomers continue to study galaxies (银河系）,space and the solar system to understand how black holes misht evolve. It is possible that black holes can exist for millions of years,and later contribute to a biggerprocess in galaxies ,which can eventually lead to creation of new entities（实体）.Scientists also credit blackholes as helpful in learning how galaxies began to form. Paragraph 2_____________A:What Happens to the Objects Around a Black Hole?B:Is There Proof That Black Holes Really Exist? C:How Were Black Holes Named? D:What Are Different Types of Black Holes?E:What Are Black Holes Made of?F:How Are Black Holes Formed?
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共用题干
Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A black hole in the universe is not a solid object,like a planet,but it is shaped like a sphere（球体）. Astronomers（天文学家）think that at the center of a black hole there is a single point in space with infinite（无限的）density（稠密）.This single point is called a singularity（奇点）. If the singularity theory is correct,it means that when a massive star collapses,all the material in it disappears into the singularity.The center of a black hole would not really be a hole at all,but an infinitely dense point.Anything that crosses the black hole is pulled in by its great gravity.Although black holes do exist,they are difficult to observe.These are the reasons.No light or anything else comes out of black holes.As a result,they are invisible to a telescope.In astronomical terms,black holes are truly tiny.For example,a black hole formed by the collapse of a giant star would have an event horizon（视界）only 18 miles across.The nearest black holes would be dozens of light years away from Earth.One light year is about 6 trillion（万亿）miles. Even the most powerlul telescopes could not pick out an object so small at such a great distance.In 1994 the Hubble Space Telescope provided evidence that black holes exist.There are still answers to be found,however,so black holes remain one of the mysteries of the universe.The nearest black holes are hundreds of light years away from us.A:Right B:Wrong C:Not mentioned
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共用题干
Black Holes1 Black holes can be best described as a sort of vacuum,sucking up everything in space.Scientists have discovered that black holes come from an explosion of huge stars.Stars that are near death can no longer burn due to loss of fuel , and because its temperature can no longer control the gravitational（重力的）force,hydrogen ends up putting pressure onto the star's surface until it suddenly explodes then collapses.2 Black holes come from stars ihat are made of hydrogen,other gases and a few metals.When these explode it can turn into a stellar-mass（恒星质量) black hole , which can only occur if the star is large enough (should be bigger than the sun)for the explosion to break it into pieces,and the gravity starts to compact every piece into the tiniest particle.Try to see and compare:if a star that's ten times the size of the sun ends up being a black hole that's no longer than 70 kilometers,then the Earth would become a black hole that'S only a fraction of an inch!3 Objects that get sucked in a black hole will always remain there,never to break free.i1it remember that black holes can only gobble up（吞噬）objects within a specific distance to it.It's possible for a large star near the sun to become a black hole,but the sun will continue to stay in place.Orbits（轨道）do not change because the newly formed black hole contains exactly the same amount of mass as when it was a star, only this time its mass is totally contracted that it can end up as no bigger than a state.4 Sofar,astronomers have figured out that black holes exist because of Albert Einstcin's theory of relativity.In the end,through numerous studies,they have discovered that black holes truly exist.Since black holes trap light and do not give off light,it is nearly impossible to detect black holes via a telescope.But astronomers continue to study galaxies（银河系）, space and the solar system to understand how black holes might evolve.It is possible that black holes can exist for millions of years,and later contribute to a bigger process in galaxies,which can eventually lead to creation of new entities（实体）.Scientists also credit black holes as helpful in learning how galaxies began to form.Black holes are formed after_________.A:the existence of black holesB:the creation of new entitiesC:the same amount of massD:an fraction of an inchE:a fraction of an inchF:the tiniest particle
考题
共用题干
Black Holes1 Black holes can be best described as a sort of vacuum,sucking up everything in space.Scientists have discovered that black holes come from an explosion of huge stars.Stars that are near death can no longer burn due to loss of fuel , and because its temperature can no longer control the gravitational（重力的）force,hydrogen ends up putting pressure onto the star's surface until it suddenly explodes then collapses.2 Black holes come from stars ihat are made of hydrogen,other gases and a few metals.When these explode it can turn into a stellar-mass（恒星质量) black hole , which can only occur if the star is large enough (should be bigger than the sun)for the explosion to break it into pieces,and the gravity starts to compact every piece into the tiniest particle.Try to see and compare:if a star that's ten times the size of the sun ends up being a black hole that's no longer than 70 kilometers,then the Earth would become a black hole that'S only a fraction of an inch!3 Objects that get sucked in a black hole will always remain there,never to break free.i1it remember that black holes can only gobble up（吞噬）objects within a specific distance to it.It's possible for a large star near the sun to become a black hole,but the sun will continue to stay in place.Orbits（轨道）do not change because the newly formed black hole contains exactly the same amount of mass as when it was a star, only this time its mass is totally contracted that it can end up as no bigger than a state.4 Sofar,astronomers have figured out that black holes exist because of Albert Einstcin's theory of relativity.In the end,through numerous studies,they have discovered that black holes truly exist.Since black holes trap light and do not give off light,it is nearly impossible to detect black holes via a telescope.But astronomers continue to study galaxies（银河系）, space and the solar system to understand how black holes might evolve.It is possible that black holes can exist for millions of years,and later contribute to a bigger process in galaxies,which can eventually lead to creation of new entities（实体）.Scientists also credit black holes as helpful in learning how galaxies began to form.Paragraph 1________A:What Happens to the Objects Around a Black Hole?B:Is There Proof That Black Holes Really Exist?C:How Were Black Holes Named?D:What Are Different Types of Black Holes?E:What Are Black Holes Made of? F: How Are Black Holes Formed?
考题
Outsidespecialareaswhichofthefollowinggarbagecandischargeintotheseawhenshipinapositionthat12nauticalmilesfromthenearestland（）.A、paperB、cookingoilcargoC、residuesthatlnotcontainanysubstancesclassifiedasharmfultothemarineenvironmentD、rags
考题
单选题On open waters，a vessel fishing is in a crossing situation with a vessel sailing located on the fishing vessel’s starboard side. Which vessel is the stand-on vessel?（）.A
The fishing vessel because it is to port of the sailing vesselB
The fishing vessel because it is fishingC
The sailing vessel because it is to starboard of the fishing vesselD
The sailing vessel because it is sailing
考题
单选题The object of plugging holes below the waterline on a ship should be to（）.A
eliminate all water entering the holeB
only plug holes in machinery or other vital spacesC
reduce the entry of water as much as possibleD
plug the largest holes first
考题
单选题Spontaneous combustion could occur in（）A
paint thinner in an open canB
fuel accumulation in the bilgeC
oily rags in an unvented compartmentD
gasoline stored in steel drums
考题
单选题Your vessel is damaged with no list，but down by the stern. There is progressive flooding and trim by the stern is increasing. What is the effect on transverse stability after the deck edge at the stern is submerged?（）A
KB increases，increasing BM and therefore GMB
KG increases due to the weight of the added water on deckC
BM decreases from loss of water plane and greater volumeD
There is no effect on transverse stability
考题
单选题A vessel aground would show the same dayshape as a（）.A
vessel towing a submerged objectB
dredge underway and dredgingC
hydrographic survey vessel at anchor and surveyingD
None of the above
考题
单选题An all-round flashing yellow light may be exhibited by a(n)（）.A
vessel not under commandB
air cushion vessel in the nondisplacement modeC
vessel towing a submerged objectD
vessel engaged in diving operations
考题
单选题A vessel constrained by her draft shall, when she overtakes a sailing vessel in a fairway,the sailing vessel is（）.A
priviledged vessel and keep her course and speedB
burdened vessel and give way to othersC
burdened vessel and keep course nad speedD
priviledged vessel and give way to others
考题
单选题What is the significance of the broken magenta lines which roughly parallel the shore between Roanoke Point and Orient Point on Long Island（）.A
They mark the limits of breakers in that areaB
These lines warn the mariner of submerged rocksC
They mark the boundary lines of fish trap areasD
These lines warn the mariner of submerged pipelines
考题
单选题The Plimsoll mark on a vessel is used to（）.A
align the vessel's tailshaftB
determine the vessel's trimC
determine the vessel's freeboardD
locate the vessel's centerline
考题
单选题A whistle signal of one prolonged，one short，one prolonged and one short blast，is sounded by a vessel（）.A
at anchorB
towing a submerged objectC
being overtaken in a narrow channelD
in distress
考题
单选题Accumulations of oily rags should be（）.A
kept in nonmetal containersB
discarded as soon as possibleC
cleaned thoroughly for reuseD
kept in the paint locker
考题
单选题An inconspicuous，partly submerged vessel or object being towed，where the length of tow is 100 meters，shall show（）.A
yellow lights at each endB
two red lights in a vertical lineC
a black ballD
a diamond shape
考题
单选题The maximum draft to which a vessel can legally be submerged is indicated by the （）.A
Loadline markB
Certificate of InspectionC
Station BillD
Tonnage mark
考题
单选题A partly submerged vessel or object being towed，which is not readily noticeable，shall show （） .A
yellow lights at each endB
two red lights in a vertical lineC
a black ballD
a diamond shape
考题
填空题There are a lot of materials which can be used for making paper, but the superiority ones are soft wood, cotton and rags.____
考题
单选题An all-round flashing yellow light may be exhibited by a(n)（）.A
vessel laying cableB
vessel towing a submerged objectC
vessel not under commandD
air cushion vessel
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