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单选题
Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the（）.
A
Alaska Current
B
Subarctic Current
C
Kuroshio Current
D
Oyashio Current
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更多 “单选题Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the（）.A Alaska CurrentB Subarctic CurrentC Kuroshio CurrentD Oyashio Current” 相关考题
考题
In a diesel engine closed freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the __.A.suction pressure regulatorB.thermostatic bypass valveC.sea water temperatureD.water level in the expansion tank
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Steam smoke will occur when ______.A.extremely cold air from shore passes over warmer waterB.warm dry air from shore passes over cooler waterC.cold ocean water evaporates into warm airD.cool rain passes through a warm air mass
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
Convection spreads a fire by ______.A.heated gases flowing through ventilation systemsB.the transfer of heat across an unobstructed spaceC.burning liquids flowing into another spaceD.transmitting the heat of a fire through the ship’s metal
考题
The purpose of mentioning the Weddell Sea is___________.A.to give an example of cold-water salinity
B.to point out the location of deep waters
C.to make a comparison between hot-water salinity and cold-water salinity
D.to show that the water in the Weddell Sea varies in salinity from place to place
考题
When did you last see a polar bear?On a trip to a zoo,perhaps?If you had attended a winter activity in New York a few years ago,you would have seen a whole polar bear club.These"Polar Bears"are people who-meet frequently in winter to swim in freezing cold water.That day,the air temperature was 3oC,and the water temperature was a bit higher.The members of the Polar Bear Club at Coney Island,New York are usually about the age of 60.Members must satisfy two requirements.First,they must get along well with everyone else in the group.This is very important because there are so many different kinds of people in the club.Polar Bears must also agree to swim outdoors at least twice a month from November through February.
Doctors do not agree about the medical effects of cold-water swimming.Some are worried about the dangers of a condition in which the body′s temperature drops so low that finally the heart stops.Other doctors,however,point out that there is more danger of a heart attack during summer swimming because the difference between the air temperature and water temperature is much greater in summer than in winter.
The Polar Bears themselves are satisfied with the benefits（or advantages）of cold-water swimming.They say that their favorite form of exercise is very good for the circulatory system（循环系统）because it forces the blood to move fast to keep the body warm.Cold-water swimmers usually turn bright red after a few minutes in the water.A person who turns blue probably has a very poor circulatory system and should not try cold-water swimming.
The main benefits（or advantages）of cold-water swimming are probably mental.The Polar Bears love to swim year-round;they find it fun and relaxing.As one 70-year-old woman says,"When I go into the water,I pour my troubles into the ocean and let them float away."
The passage is mainly aboutA.a group of cold-water-swimming lovers
B.the Polar Bears'life in New York
C.doctors'ideas about cold-water swimming
D.the requirements of the Polar Bear Club
考题
When did you last see a polar bear?On a trip to a zoo,perhaps?If you had attended a winter activity in New York a few years ago,you would have seen a whole polar bear club.These"Polar Bears"are people who-meet frequently in winter to swim in freezing cold water.That day,the air temperature was 3oC,and the water temperature was a bit higher.The members of the Polar Bear Club at Coney Island,New York are usually about the age of 60.Members must satisfy two requirements.First,they must get along well with everyone else in the group.This is very important because there are so many different kinds of people in the club.Polar Bears must also agree to swim outdoors at least twice a month from November through February.
Doctors do not agree about the medical effects of cold-water swimming.Some are worried about the dangers of a condition in which the body′s temperature drops so low that finally the heart stops.Other doctors,however,point out that there is more danger of a heart attack during summer swimming because the difference between the air temperature and water temperature is much greater in summer than in winter.
The Polar Bears themselves are satisfied with the benefits（or advantages）of cold-water swimming.They say that their favorite form of exercise is very good for the circulatory system（循环系统）because it forces the blood to move fast to keep the body warm.Cold-water swimmers usually turn bright red after a few minutes in the water.A person who turns blue probably has a very poor circulatory system and should not try cold-water swimming.
The main benefits（or advantages）of cold-water swimming are probably mental.The Polar Bears love to swim year-round;they find it fun and relaxing.As one 70-year-old woman says,"When I go into the water,I pour my troubles into the ocean and let them float away."
DoctorsA.encourage people to take part in cold-water swimming actively
B.point out the possible danger of blood illness during cold-water swimming
C.believe swimming is helpful both in winter and in summer
D.have different ideas about the medical effects of cold-water swimming
考题
When did you last see a polar bear?On a trip to a zoo,perhaps?If you had attended a winter activity in New York a few years ago,you would have seen a whole polar bear club.These"Polar Bears"are people who-meet frequently in winter to swim in freezing cold water.That day,the air temperature was 3oC,and the water temperature was a bit higher.The members of the Polar Bear Club at Coney Island,New York are usually about the age of 60.Members must satisfy two requirements.First,they must get along well with everyone else in the group.This is very important because there are so many different kinds of people in the club.Polar Bears must also agree to swim outdoors at least twice a month from November through February.
Doctors do not agree about the medical effects of cold-water swimming.Some are worried about the dangers of a condition in which the body′s temperature drops so low that finally the heart stops.Other doctors,however,point out that there is more danger of a heart attack during summer swimming because the difference between the air temperature and water temperature is much greater in summer than in winter.
The Polar Bears themselves are satisfied with the benefits（or advantages）of cold-water swimming.They say that their favorite form of exercise is very good for the circulatory system（循环系统）because it forces the blood to move fast to keep the body warm.Cold-water swimmers usually turn bright red after a few minutes in the water.A person who turns blue probably has a very poor circulatory system and should not try cold-water swimming.
The main benefits（or advantages）of cold-water swimming are probably mental.The Polar Bears love to swim year-round;they find it fun and relaxing.As one 70-year-old woman says,"When I go into the water,I pour my troubles into the ocean and let them float away."
According to the passage,some doctors believe it is true thatA.you are healthy if cold-water swimming turns your skin color blue
B.cold-water swimming causes more heart attacks in summer than in winter
C.cold-water swimming can make the body temperature dangerously high
D.Polar Bears are bears swimming in freezing water
考题
以下英文描述表示“冷水手洗”的选项是（）。A、Do not wash by hand Water washingB、Cold water to washC、Hand wash in cold waterD、Dry cleaning only
考题
（）part is the most densely populated region in America.A、The southernB、The northeasternC、The western
考题
单选题Living in the western part of the country has its problems,_____ obtaining fresh water is not the least.A
with whichB
for whichC
of whichD
which
考题
单选题While flowing through the volute in a centrifugal pump, part of the （） energy of the liquid is converted to （） energy.A
kinetic；pressureB
kinetic；essentialC
pressure；kineticD
pressure；height
考题
单选题请阅读 Passage 1，完成第 21~25小题。Passage 1These days，many large city buildings are equipped with their own air-conditioning systems.These systems help keep the buildings cool，but they can also damage the environment.Since they use a lot of electricity，for instance，they contribute indirectly to global warming.In addition，the water that flows through the systems is often cooled using chemicals called chlorofluorocarbons，or CFCs，that are believed to damage the Earth's ozone layer.Recently，though，a system has been built in the city of Toronto，Canada，that cools buildings with little damage to the environment. In the traditional air-conditioning systems found in most large buildings，water is pumped through the building in a continuous cycle.The water is first cooled to a temperature of 4℃ in machines called chillers.It is then sent to individual units that cool the air in each room.As the water flows through the building，it gradually becomes warmer.Finally，it reaches the roof ，where it is left to cool down naturally in a water tower.After that it is returned to the chillers，where the cycle begins again.Toronto lies on the shore of Lake Ontario，one of North America's Great Lakes，and the new system makes use of cold water taken from about 80 meters below the surface of the lake.At this depth，the water in the lake remains at 4℃ all year round.This is exactly the temperature to which the water in air-conditioning systems is cooled.However，the water from the lake is not pumped directly into the air-conditioning systems.Instead，it is used to cool the water that is already inside the air-conditioning systems.After that，the lake water is added to the city's ordinary water supply.Enwave，the company that developed this deep-lake cooling system，says that it uses 75 percent less energy than traditional air conditioning.And since no CFCs are used，no damage can be caused to the ozone layer.Not every city is located next to a large lake，but experts believe that systems like the one being used in Toronto could be built elsewhere by using other natural sources of cold water.What is the function of the chillers in a traditional air-conditioning system?A
They pump the air continuously to the units in each room.B
They lower the temperature of the water in the system.C
They help the water cool down naturally on the roof .D
They gradually clean the water as it flows through the building.
考题
单选题Convection spreads a fire by（）.A
heated gases flowing through ventilation syetemB
the transfer of heat across an unobstructed spaceC
burning liquids flowing into another spaceD
transmitting the heat of a fire through the ships metal
考题
单选题Convection spreads a fire as a result of （）.A
transmitting the heat of a fire through the ships metalB
burning liquids flowing into another spaceC
heated gases flowing through ventilation systemsD
the transfer of heat across an unobstructed space
考题
单选题As the air passes through the charge air cooler, its temperature may be reduced and moisture condensed, with the condensate in danger of being carried into the engineSo a water separator should be mounted beneath the bottom part of the engine inlet manifoldA water separator is used in order to （）.A
keep the air from being carried into the engineB
keep the moisture from being condensedC
keep the danger from being carded into the engineD
take away the condensate from the air
考题
单选题（）is electricity that is flowing where it’s not supposed to through water, fittings on your boat, wet wood, damp surfaces, etc.A
Stray currentB
Rated currentC
Starting currentD
Earth current
考题
单选题Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?（）A
The colder seawater passing through the condenser tube bundles of the various stages increases evaporator vacuumB
The amount of heated feed water discharged from the feed water heater after cndenser is increasedC
Fewer non-condensable gases are created by the flow of colder seawaterD
More seawater is allowed to pass through the flint stage overflow weir
考题
单选题When sailing in cold zones, the（） should be drained of water.A
the ventilation pipeB
the water line for fire fighting on the deckC
the fuel oil lineD
the water supplying line in bath room
考题
单选题Living in the western part of the country has its problems, ______ obtaining fresh water is not the least.A
with which B
for which C
of which D
which
考题
单选题Which of the following methods is normally used to control the temperature of air distributed from individual cooling coils in an air conditioning system using a chilled water circulation system?（）A
A room thermostat activates an electric heater at each individual chilled air outlet when necessaryB
Varying the number of passes the air makes across the coilsC
Varying the temperature of the water through the coilsD
Varying the quantity of water flowing through the coils
考题
单选题In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the （）.A
suction pressure regulatorB
thermostatic bypass valveC
sea water temperatureD
water level in the expansion tank
考题
单选题Steam smoke will occur when（）.A
extremely cold air from shore passes over warmer waterB
warm dry air from shore passes over cooler waterC
cold ocean water evaporates into warm airD
cool rain passes through a warm air mass
考题
单选题Physical exertion on the part of a person who has fallen into cold water would（）.A
be the best thing to try if there was no rescue in sightB
increase survival time in the waterC
increase the rate of heat loss from the bodyD
not affect the heat loss from the body
考题
单选题The pipe friction and the resistance will （） as a result of an increase in the amount of fluid flowing through the system.A
reduceB
riseC
raiseD
fall
考题
问答题You are trying to fill a bath with both taps on, but have accidentally left out the plug. Normally the hot water tap takes 8 minutes to fill the bath and the cold water tap takes 10 minutes. However, the water empties out through the plug hole in 5 minutes. How long will it take for the bath to fill?
考题
单选题Radiation can spread a fire by （）.A
transmitting the heat of a fire through the ship s metalB
burning liquids flowing into another spaceC
heated gases flowing through ventilation systemsD
the transfer of heat across an unobstructed space
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