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单选题
As a ship moves through the water，it drags with it a body of water called the wake. The ratio of the wake speed to the ship’s speed is called（）.
A
propeller velocity
B
speed of advance
C
wake distribution
D
wake fraction
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更多 “单选题As a ship moves through the water，it drags with it a body of water called the wake. The ratio of the wake speed to the ship’s speed is called（）.A propeller velocityB speed of advanceC wake distributionD wake fraction” 相关考题
考题
Water is the __46___ of all the things we eat and drink . Not many people understand this but __47____ quite true . The human body can go without ___48___ for a long time . We’ve got many examples for this . Yet two __49___ three days without water can usually make people __50____ . Man can’t live __51____ water .Many people don’t understand how ___52__ water the human body needs __53___ work well , and many people , especially young people , do not drink enough , ___54__ in very hot weather . Our body has mostly water , about 65% to 75% . That is to say about two thirds of our body is water . When we do sports , some of the water will get away from our body . __55 _ we don’t drink some water , we won’t have enough water． And if we don’t have enough water , we’ll feel tired and many of us will get ill . So you know how important water is to us .46.___________( )46. A. importantB. most importantC. more importantD. different
考题
Passage TwoOnly one animal can walk 200 miles without stopping once to rest. It would take a person two days and two nights to walk this far, and only one man has ever done it without stopping. What amazing animal has such endurance? The camel! The camel is well known for something else, too. It can cross an entire desert without a single drink of water. Its body is built in a special way to help it store water and food.A person has just one stomach, but a camel has quite a few. Within each stomach are layers and layers of cells. These cells are like tiny water balloons, storing liquids until the camel needs them. When the camel drinks, the cells grow larger and larger. For a whole week, they can keep the animal's thirst away by sending water to all parts of its body.And did you ever wonder why the camel has a hump? The hump is a storage place for fat. Because it has this storage area, the camel does not need to eat very often. When the animal needs energy, the layers of fat serve as fuel to keep it going on the long, hot days in the burning sun.The camel has one other gift that makes it well suited to arid regions. This gift is its amazing nose. A camel can smell a water hole from miles away!When a camel moves it sways from side to side like a ship on a wavy ocean. Because of this swaying motion, the camel has been called the "Ship of the Desert."40. The camel's hump is a storage place for ______.A. musclesB. extra waterC. body sugarsD. fat
考题
When is the density of the water required to be logged in the logbook of a ship?A.Any time the vessel moves from water of one density into waters of a different densityB.Prior to getting underway when the vessel is floating in fresh or brackish waterC.Only when the vessel moves from fresh water into salt waterD.The density of the water is not required to be logged in the unofficial logbook
考题
After abandoning a vessel，water that is consumed within the first 24 hours will ______.A.pass through the body with little absorbed by the systemB.help to prevent fatigueC.quench thirst for only 2 hoursD.help to prevent seasickness
考题
Which statement about damage control is TRUE ________．A.A hole in the hull at the waterline is more dangerous than a hole below the inner bottomB.The amount of water entering a ship through a hole varies inversely to the area of the holeC.Water flowing into a lower compartment on a ship is more dangerous than water on deck or flowing into an upper compartmentD.Water flowing over the forecastle bulwark is more dangerous than a hole in the hull at the waterline
考题
Heat exhaustion is caused by excessive ______.A.loss of body temperatureB.loss of water and salt from the bodyC.gain in body temperatureD.intake of water when working or exercising
考题
If you wear extra clothing when entering the water after abandoning ship it will ______.A.weigh you downB.preserve body heatC.reduce your body heatD.make it more difficult to bteathe
考题
In practice, it is usual for ship to be loaded _____ to improve the vessel’s movement through the water.A.a little deeper aftB.a little deeper forwardC.at the same draught between fore and aftD.a balance between two sides
考题
Topside paint is applied to the area of the ship’s （）which is out of water when the ship is loaded.A、hullB、cabinC、cargo holdD、deck
考题
单选题If you wear extra clothing when entering the water after abandoning ship it will（）.A
weigh you downB
preserve body heatC
reduce your body heatD
make it more difficult to breathe
考题
单选题Passage2 Questions 6 to 10 are based on the following passage. Salt is as necessary to life as water. In many areas of Africa people once drank the urine（尿）of animals because they had no other source of salt. Without salt, human beings die. The human body demands that the amount of salt in the blood always stay the same. When the body does not get enough salt, it protects itself by letting less salt leave the body in. urine and sweat. But it cannot reduce this output to zero. Some salt is always escaping. On a completely saltless diet, like that of some people in Africa, the body steadily loses small amounts of salt through the kidneys（肾） and sweat glands(腺). It then tries to adjust to this loss by speeding up its secretion(分泌) of water. (78) In this way, the body attempts to keep the amount of salt in the blood at the necessary level. The result is a slow drying up of body and, finally, death. The person dies of thirst. In cases where there is little or no water to drink, the body tries to do the opposite thing.Again, it must keep the salt level in the blood constant. Because it has little water, it attempts to stop water from leaving the body and to increase its secretion of. salt. But, as with the escaping salt, it cannot be completely successful. Some water still leaves and the person eventually dies of thirst. In short, the body's normal needs for salt and for water are both parts of the same important need to keep the salt level in the blood constant.6 Some African people once drank animal urine______.A
when they were going to dieB
because they were thirstyC
because there was little saltD
because they were short of water
考题
单选题A ship is side to be（）when the whole ship moves bodily to port and then to starboard.A
rollingB
pitchingC
heavingD
swaying
考题
单选题A ship will always want to settle into a position where（）.A
the pivot point and point of influence of wind in are not in alignmentB
the pivot point and point of influence of wind in are in alignmentC
the point of influence of wind moves depending on the profile of the ship presented to the windD
the ship steams slowly in rough seas
考题
单选题（）water is the water in the hold to keep the ship’s stability.A
BilgeB
BallastC
SlopD
Sanitary
考题
单选题As a ship moves through the water，it causes a wake，which is also moving forward relative to the sea. In addition to a fore and aft motion，this wake also has a(n)（）.A
downward and inward flowB
downward and outward flowC
upward and inward flowD
upward and outward flow
考题
单选题A new ocean going ship of 2000 gross tons having an inoperative oily water separator may dispose of its bilge slops by （）.A
holding its slops onboard until they can be pumped into the city sewer systemB
circulating them through the lube oil purifier to remove water and debrisC
holding its slops onboard until they can be discharged to a shore side reception facilityD
pumping them into a settling tank for separation before pumping the oily water residue overboard
考题
单选题When a tornado moves over the water from land it is called a（）.A
TornadoB
WaterspoutC
HurricaneD
Cyclone
考题
单选题In practice, it is usual for the ship to be loaded（）to improve the vessel’s movement through the water.A
a little deeper aftB
a little deeper forwardC
at the same draught between fore and aftD
a balance between two sides
考题
单选题When a ship in loaded condition floats at arbitrary water line, its displacement is to the relevant mass of water displaced by the ship（）A
equalB
largerC
smallerD
equivalent
考题
单选题Passage2 Questions 6 to 10 are based on the following passage. Salt is as necessary to life as water. In many areas of Africa people once drank the urine（尿）of animals because they had no other source of salt. Without salt, human beings die. The human body demands that the amount of salt in the blood always stay the same. When the body does not get enough salt, it protects itself by letting less salt leave the body in. urine and sweat. But it cannot reduce this output to zero. Some salt is always escaping. On a completely saltless diet, like that of some people in Africa, the body steadily loses small amounts of salt through the kidneys（肾） and sweat glands(腺). It then tries to adjust to this loss by speeding up its secretion(分泌) of water. (78) In this way, the body attempts to keep the amount of salt in the blood at the necessary level. The result is a slow drying up of body and, finally, death. The person dies of thirst. In cases where there is little or no water to drink, the body tries to do the opposite thing.Again, it must keep the salt level in the blood constant. Because it has little water, it attempts to stop water from leaving the body and to increase its secretion of. salt. But, as with the escaping salt, it cannot be completely successful. Some water still leaves and the person eventually dies of thirst. In short, the body's normal needs for salt and for water are both parts of the same important need to keep the salt level in the blood constant.7 In order to adjust to the loss of salt, the body______.A
loses some bloodB
speeds up its secretion of waterC
speeds up its secretion of saltD
is drying up slowly
考题
单选题（）is a roud-shaped underwater part in the front of the ship.The purpose is to cre-ate less friction with water so that the ship moves more easily.A
The bulbous bowB
The anchorC
The bow thrusterD
The propeller
考题
单选题After abandoning a vessel，water that is consumed within the first 24 hours will（）.A
pass through the body with little absorbed by the systemB
help to prevent fatigueC
quench thirst for only 2 hoursD
help to prevent seasickness
考题
单选题When is the density of the water required to be logged in the logbook of a ship?（）A
Any time the vessel moves from water of one density into waters of a different densityB
Prior to getting underway when the vessel is floating in fresh or brackish waterC
Only when the vessel moves from fresh water into salt waterD
The density of the water is not required to be logged in the unofficial logbook
考题
单选题The distance that a ship moves forward with each revolutionof its propeller，if there is no slip，is called（）.A
advanceB
head reachC
pitchD
transfer
考题
单选题The resistance experienced when one body moves over another, _____ it is in contact, is called frictional force.A
to whichB
whereC
with whichD
while
考题
单选题Passage2 Questions 6 to 10 are based on the following passage. Salt is as necessary to life as water. In many areas of Africa people once drank the urine（尿）of animals because they had no other source of salt. Without salt, human beings die. The human body demands that the amount of salt in the blood always stay the same. When the body does not get enough salt, it protects itself by letting less salt leave the body in. urine and sweat. But it cannot reduce this output to zero. Some salt is always escaping. On a completely saltless diet, like that of some people in Africa, the body steadily loses small amounts of salt through the kidneys（肾） and sweat glands(腺). It then tries to adjust to this loss by speeding up its secretion(分泌) of water. (78) In this way, the body attempts to keep the amount of salt in the blood at the necessary level. The result is a slow drying up of body and, finally, death. The person dies of thirst. In cases where there is little or no water to drink, the body tries to do the opposite thing.Again, it must keep the salt level in the blood constant. Because it has little water, it attempts to stop water from leaving the body and to increase its secretion of. salt. But, as with the escaping salt, it cannot be completely successful. Some water still leaves and the person eventually dies of thirst. In short, the body's normal needs for salt and for water are both parts of the same important need to keep the salt level in the blood constant.8 Which of the following statements is NOT the result of a lack of salt in the body?A
The body secretes more water.B
The body dries up.C
The person dies of thirst.D
The person gets fatter.
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