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单选题
Ocean currents are well defined and（）.
A
create large waves in the direction of the current
B
change direction 360°during a 24 hour period
C
remain fairly constant in direction and velocity throughout the year
D
are characterized by a light green color
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共用题干
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In AsyncOS 7.0 for web the choice of Authentication Surrogate is？（）A、 A global settingB、 Defined separately for each Access PolicyC、 Defined separately for each IdentityD、 Defined separately for each malware engine
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Which of these statements concerning the collection interfaces are true？（） A、Set extends Collection.B、All methods defined in Set are also defined in Collection.C、List extends Collection.D、All methods defined in List are also defined in Collection.E、Map extends Collection.
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单选题Generally speaking，a ship steaming across the North Pacific from Japan to Seattle is likely to experience（）.A
adverse currents for practically the entire crossingB
favorable currents for practically the entire crossingC
favorable currents in the summer months and adverse currents in the winter monthsD
variable currents having no significant effect on the total steaming time
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判断题Other countries surrounding the ocean are strongly opposed to Russia’s claim to a large part of the ocean.A
对B
错
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问答题Practice 2 Until recently, scientists knew little about life in the deep sea, nor had they reason to believe that it was being threatened. Now, with the benefit of technology that allows for deeper exploration, researchers have uncovered a remarkable array of species inhabiting the ocean floor at depths of more than 660 feet, or about 200 meters. At the same time, however, technology has also enabled fishermen to reach far deeper than ever before, into areas where bottom trawls can destroy in minutes what has taken nature hundreds and in some cases thousands of years to build. Many of the world's coral species, for example, are found at depths of more than 200 meters. It is also estimated that roughly half of the world's highest seamounts - areas that rise from the ocean floor and are particularly rich in marine life - are also found in the deep ocean. These deep sea ecosystems provide shelter, spawning and breeding areas for fish and other creatures, as well as protection from strong currents and predators. Moreover, they are believed to harbor some of the most extensive reservoirs of life on earth, with estimates ranging from 500,000 to 100 million species inhabiting these largely unexplored and highly fragile ecosystems.
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单选题The drift and set of tidal，river，and ocean currents refer to the（）.A
position and area of the currentB
speed and direction toward which the current flowsC
type and characteristic of the current's flowD
None of the above
考题
单选题The two most effective generating forces of surface ocean currents are（）.A
temperature and salinity differences in the waterB
wind and density differences in the waterC
water depth and underwater topographyD
rotation of the Earth and continental interference
考题
单选题In the Sargasso Sea there are large quantities of seaweed and no well defined currents. This area is located in the（）.A
Central North Atlantic OceanB
Caribbean SeaC
Western North Pacific OceanD
area off the west coast of South America
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多选题Which of these statements concerning the collection interfaces are true？（）ASet extends Collection.BAll methods defined in Set are also defined in Collection.CList extends Collection.DAll methods defined in List are also defined in Collection.EMap extends Collection.
考题
单选题When steering a tow downstream around the shape of a sand bar，and staying on the proper side of the buoys，an operator should be cautious of（）.A
eddies under the barB
swift current under the bar causing loss of controlC
cross-currents pushing the tow away from the barD
cross-currents pushing the tow into the bar
考题
单选题You are on an ice-reinforced vessel about to enter packice. You should（）.A
enter the pack on the windward side where there is a well defined ice edgeB
trim to an even keel or slightly down by the bow to take maximum benefit of the ice reinforcementC
take maximum advantage of coastal leads caused by offshore windsD
look for areas of rotten ice and enter perpendicular to the ice edge
考题
单选题One of the causes of ocean currents is density differences in the water. This is true because （）.A
in an area of high density the water's surface is lower than in an area of low densityB
surface water flows from an area of high density to one of low densityC
the lesser the density gradient the freer the water is to moveD
it is the density differences that cause the currents to stay in the troughs
考题
单选题One of the factors which affects the circulation of ocean currents is（）.A
humidityB
varying densities of waterC
vessel trafficD
the jet stream
考题
单选题In the Northern Hemisphere the major ocean currents tend to flow（）.A
clockwise around the North Atlantic and North Pacific OceansB
clockwise or counterclockwise depending on whether it is warm or cold currentC
counterclockwise except in the Gulf StreamD
counterclockwise around the North Atlantic and North Pacific Oceans
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