单选题The new study published in Science indicates that______.A low-level clouds tend to warm the ocean.B more cloud cover means a warmer world.C the warming of ocean is a threat to the low-level clouds.D the Pacific Ocean has more low-level clouds than befo
题目
单选题
The new study published in Science indicates that______.
A
low-level clouds tend to warm the ocean.
B
more cloud cover means a warmer world.
C
the warming of ocean is a threat to the low-level clouds.
D
the Pacific Ocean has more low-level clouds than before.
相似考题
参考答案和解析
正确答案：
D
解析：
事实细节题。由题干The new study published in Science定位至第三段第三句low-level clouds tend to dissipate as the ocean warms，由此可知C为正确答案；文中提到海洋变暖对低云层的影响，并非低层云让海洋变暖，故排除A；由前文可知，更热的世界意味着更少的云，故排除B和D。
事实细节题。由题干The new study published in Science定位至第三段第三句low-level clouds tend to dissipate as the ocean warms，由此可知C为正确答案；文中提到海洋变暖对低云层的影响，并非低层云让海洋变暖，故排除A；由前文可知，更热的世界意味着更少的云，故排除B和D。
更多“单选题The new study published in Science indicates that______.A low-level clouds tend to warm the ocean.B more cloud cover means a warmer world.C the warming of ocean is a threat to the low-level clouds.D the Pacific Ocean has more low-level clouds than befo”相关问题
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第1题：
Chinese Internet users tend to use more proper and skillful search means for locating keywords and handling search engines than their Japanese______.A.counterparts
B.friends
C.pioneers
D.classmates答案：A解析：本题考查近义词辨析。题目意为“与他们的日本____相比，中国互联网用户倾向于使用更加恰当和熟练的搜索方式来查找关键字和处理搜索引擎。” A选项“与另一方作用相当的物”， B选项“朋友”，C选项“开拓者”，D选项“同学”。根据题干，Chinese Internet users（中国互联网用户）与Japanese（日本用户）相对应，因此A选项符合题意。
-
第2题：
共用题干
第一篇
Arctic Melt
Earth’s North and South Poles are famous for being cold and icy.Last year,however,the amnount of ice
in the Arctic Ocean（北冰洋）fell to a record low.
Normally,ice builds in Arctic waters around the North Pole each winter and shrinks（缩小）during the
summer. But for many years,the amount of ice left by the end of summer has been declining.
Since 1979,each decade has seen an 11.4 percent drop in end?of-summer ice cover. Between 1981 and
2000,ice in the Arctic lost 22 percent of its thickness,becoming I.13 meters thinner.
Last summer,Arctic sea ice reached its thinnest levels yet.By the end of summer 2007,the ice had
shrunk to cover just 4.2 million square kilometers.That's 38 percent less area than the average cover at that
time of year. And it's a very large 23 percent below the previous record low,which was set just 2 years ago.
This continuing trend has made scientists concerned.
There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer（海洋学家）at the
University of Washington at Seattle.Unusually strong winds blew through the Arctic last summer. The winds
pushed much of the ice out of the central Arctic,leaving a large area of thin ice and open water.
Scientists also suspect that fewer clouds cover the Arctic now than in the past.Clearer skies allow more
sunlight to reach the ocean.The extra heat warms both the water and the atmosphere.In parts of the Arctic
Ocean last year,surface temperatures were 3.5℃warmer than average and 1.5℃warmer than the previous
record high.
With both air and water getting warmer,the ice is melting from both above and below. In some parts of
the Beaufort Sea,north of Alaska and western Canada,ice that measured 3.3 meters thick at the beginning
of the summer measured just 50 centimeters by season's end.
The new measurements suggest that melting is far more severe than scientists have seen by just looking
at ice covcrfrom above,says Donald K. Perovich,a geophysicist at the U.S.Army Cold Regions Research
and Engineering Laboratory in Hanover,N.H.
Some scientists fear that the Arctic is stuck in a warming trend from which it may never recover.It can be learned from the last sentence that _________.
A:the ice melt in the Arctic may never stop
B:scientists are trying hard to stop the ice melt in the Arctic
C:scientists are delighted to find out what is going on in the Arctic
D:the warming trend in the Arctic can be reversed in the near future答案：A解析：build在此处是“增长，扩大”的意思。expand有“扩张”的意思，所以与build含义相符。
根据第四段第二句可知答案。
第五段的最后一句话和第六段的第一、二句话说明了科学家们推测的冰川融化的原因：一为强风，二为较少的云。
短文第七段举例说明在一个夏天冰层可以以令人难以置信的速度巡逗融化。
短文最后一句提到，一些科学家担心北极已经陷人可能永远无法恢复的变暖趋势之中。第二篇 本文主要讲述了两个失聪的青少年之间的故事。 -
第3题：
共用题干
第一篇
Arctic Melt
Earth’s North and South Poles are famous for being cold and icy.Last year,however,the amnount of ice
in the Arctic Ocean（北冰洋）fell to a record low.
Normally,ice builds in Arctic waters around the North Pole each winter and shrinks（缩小）during the
summer. But for many years,the amount of ice left by the end of summer has been declining.
Since 1979,each decade has seen an 11.4 percent drop in end?of-summer ice cover. Between 1981 and
2000,ice in the Arctic lost 22 percent of its thickness,becoming I.13 meters thinner.
Last summer,Arctic sea ice reached its thinnest levels yet.By the end of summer 2007,the ice had
shrunk to cover just 4.2 million square kilometers.That's 38 percent less area than the average cover at that
time of year. And it's a very large 23 percent below the previous record low,which was set just 2 years ago.
This continuing trend has made scientists concerned.
There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer（海洋学家）at the
University of Washington at Seattle.Unusually strong winds blew through the Arctic last summer. The winds
pushed much of the ice out of the central Arctic,leaving a large area of thin ice and open water.
Scientists also suspect that fewer clouds cover the Arctic now than in the past.Clearer skies allow more
sunlight to reach the ocean.The extra heat warms both the water and the atmosphere.In parts of the Arctic
Ocean last year,surface temperatures were 3.5℃warmer than average and 1.5℃warmer than the previous
record high.
With both air and water getting warmer,the ice is melting from both above and below. In some parts of
the Beaufort Sea,north of Alaska and western Canada,ice that measured 3.3 meters thick at the beginning
of the summer measured just 50 centimeters by season's end.
The new measurements suggest that melting is far more severe than scientists have seen by just looking
at ice covcrfrom above,says Donald K. Perovich,a geophysicist at the U.S.Army Cold Regions Research
and Engineering Laboratory in Hanover,N.H.
Some scientists fear that the Arctic is stuck in a warming trend from which it may never recover.What are the reasons for the ice melting according to the scientists?
A:Strong winds and clear skits.
B:Longer summers and shorter winters.
C:Open water and thin ice.
D:Heavy clouds and light winds.答案：A解析：build在此处是“增长，扩大”的意思。expand有“扩张”的意思，所以与build含义相符。
根据第四段第二句可知答案。
第五段的最后一句话和第六段的第一、二句话说明了科学家们推测的冰川融化的原因：一为强风，二为较少的云。
短文第七段举例说明在一个夏天冰层可以以令人难以置信的速度巡逗融化。
短文最后一句提到，一些科学家担心北极已经陷人可能永远无法恢复的变暖趋势之中。第二篇 本文主要讲述了两个失聪的青少年之间的故事。 -
第4题：
Nowadays with the development of science, more and more new technology__________to the fields of IT.A.has introduceD.
B.was introduceD.
C.will introduce
D.is being introduceD.答案：D解析：考查动词时态及语态。句意为“当今随着科学的发展，越来越多的新技术正在被引进到许多IT'领域”。根据句意，本句应用现在进行时的被动语态。故选D。 -
第5题：
什么是低层（位）码（low-level code，简称LLC）？
正确答案:低层(位）码（low-level code，简称LLC），物料的低层码是系统分配给物料清单上的每个物品一个从0至N的数字码。在产品结构中，最上层的层级码为0，下一层的部件的层级码则为1，一个物品只能有一个MRP低层码，当一个物品在多个产品中所处的产品结构层次不同或即使处于同一产品结构中的但却处于不同产品结构层次时，则取处在最低层的层级码作为该物品的低层码。 -
第6题：
单选题A sufficient amount of chain must be veered when anchoring a vessel to ensure（）.Athe vessel has enough room to swing while at anchor
Bthe anchor flukes bite into the ocean bottom
Cthere is a sufficient scope of chain to keep the anchor on the bottom
Dthere is more chain out than there is in the chain locker
正确答案： B解析： 暂无解析 -
第7题：
单选题We can conclude from the last paragraph that______.Atrade winds are harmful to the low clouds.
Bdeep clouds are helpful to cool the earth.
Cglobal warming can result in more low clouds.
Dglobal warming can destroy the form of atmosphere.
正确答案： C解析：
推理判断题。由题干关键词定位至原文末段。由该段第二句as the earth’s surface warms, the atmosphere becomes more unstable推知，地球变暖可能改变大气构成，而这种改变又是负面的，故D为正确答案。由该段倒数第二句the trade winds weakened, which further dissipated the low clouds，可推知信风对低云层有利，故排除A；由该段第三句Those types of high-altitude clouds don’t have the same cooling effect排除B；由该段倒数第二句可知随着海洋的变暖，低层云层变少了，排除C。 -
第8题：
问答题什么是低层（位）码（low-level code，简称LLC）？正确答案： 低层(位）码（low-level code，简称LLC），物料的低层码是系统分配给物料清单上的每个物品一个从0至N的数字码。在产品结构中，最上层的层级码为0，下一层的部件的层级码则为1，一个物品只能有一个MRP低层码，当一个物品在多个产品中所处的产品结构层次不同或即使处于同一产品结构中的但却处于不同产品结构层次时，则取处在最低层的层级码作为该物品的低层码。解析： 暂无解析 -
第9题：
单选题In the Northern Hemisphere，what type of cloud formations would you expect to see to the west of an approaching tropical wave?（）.ACumulus clouds lined up in rows extending in a northeast to southwest direction
BHigh altostratus clouds in the morning hours
CCirrostratus clouds lined up in rows extending in a northeast to southwest direction
DCirrostratus clouds lined up in rows extending in a north to south direction
正确答案： D解析： 暂无解析 -
第10题：
单选题It can be inferred from the second paragraph that______.Alow-altitude clouds are the main causes of global warming.
Bincrease of cloud cover can slow down the climate change.
Cglobal warming will increase cloud cover.
Dincrease of cloud cover can speed up the global warming.
正确答案： D解析：
推理判断题。根据题干提示定位至第二段。该段low-level clouds tend to dissipate as the ocean warms—which means a warmer world could well have less cloud cover，可推知B increase of cloud cover can slow down the climate change与之相符，故为正确答案；D 含义与B相反,故排除；由第二段第二句Low-altitude clouds reflect some of the sun’s radiation back into the atmosphere, cooling the earth.可知，A错；第二段最后一句It’s not yet known whether global warming will dissipate clouds or increase cloud cover，故排除C。 -
第11题：
单选题Steam smoke will occur when（）.AExtremely cold air from shore passes over warmer water
BWarm dry air from shore passes over cooler water
CCold ocean water evaporates into warm air
DCool rain passes through a warm air mass
正确答案： B解析： 暂无解析 -
第12题：
单选题A cold front moving in from the northwest can produce（）.Athunderstorms，hail，and then rapid clearing
Bincreasing cloud cover lasting for several days
Clengthy wet weather
Dlow ceilings with thick cirrus clouds
正确答案： A解析： 暂无解析 -
第13题：
共用题干
第一篇
Arctic Melt
Earth’s North and South Poles are famous for being cold and icy.Last year,however,the amnount of ice
in the Arctic Ocean（北冰洋）fell to a record low.
Normally,ice builds in Arctic waters around the North Pole each winter and shrinks（缩小）during the
summer. But for many years,the amount of ice left by the end of summer has been declining.
Since 1979,each decade has seen an 11.4 percent drop in end?of-summer ice cover. Between 1981 and
2000,ice in the Arctic lost 22 percent of its thickness,becoming I.13 meters thinner.
Last summer,Arctic sea ice reached its thinnest levels yet.By the end of summer 2007,the ice had
shrunk to cover just 4.2 million square kilometers.That's 38 percent less area than the average cover at that
time of year. And it's a very large 23 percent below the previous record low,which was set just 2 years ago.
This continuing trend has made scientists concerned.
There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer（海洋学家）at the
University of Washington at Seattle.Unusually strong winds blew through the Arctic last summer. The winds
pushed much of the ice out of the central Arctic,leaving a large area of thin ice and open water.
Scientists also suspect that fewer clouds cover the Arctic now than in the past.Clearer skies allow more
sunlight to reach the ocean.The extra heat warms both the water and the atmosphere.In parts of the Arctic
Ocean last year,surface temperatures were 3.5℃warmer than average and 1.5℃warmer than the previous
record high.
With both air and water getting warmer,the ice is melting from both above and below. In some parts of
the Beaufort Sea,north of Alaska and western Canada,ice that measured 3.3 meters thick at the beginning
of the summer measured just 50 centimeters by season's end.
The new measurements suggest that melting is far more severe than scientists have seen by just looking
at ice covcrfrom above,says Donald K. Perovich,a geophysicist at the U.S.Army Cold Regions Research
and Engineering Laboratory in Hanover,N.H.
Some scientists fear that the Arctic is stuck in a warming trend from which it may never recover.By the end of summer 2007 the ice cover in the Arctic was ________.
A:4.2 million square kilometers
B:11.4 million square kilometers
C:1.13 million square kilometers
D:38 million square kilometers答案：A解析：build在此处是“增长，扩大”的意思。expand有“扩张”的意思，所以与build含义相符。
根据第四段第二句可知答案。
第五段的最后一句话和第六段的第一、二句话说明了科学家们推测的冰川融化的原因：一为强风，二为较少的云。
短文第七段举例说明在一个夏天冰层可以以令人难以置信的速度巡逗融化。
短文最后一句提到，一些科学家担心北极已经陷人可能永远无法恢复的变暖趋势之中。第二篇 本文主要讲述了两个失聪的青少年之间的故事。 -
第14题：
共用题干
第一篇
Arctic Melt
Earth’s North and South Poles are famous for being cold and icy.Last year,however,the amnount of ice
in the Arctic Ocean（北冰洋）fell to a record low.
Normally,ice builds in Arctic waters around the North Pole each winter and shrinks（缩小）during the
summer. But for many years,the amount of ice left by the end of summer has been declining.
Since 1979,each decade has seen an 11.4 percent drop in end?of-summer ice cover. Between 1981 and
2000,ice in the Arctic lost 22 percent of its thickness,becoming I.13 meters thinner.
Last summer,Arctic sea ice reached its thinnest levels yet.By the end of summer 2007,the ice had
shrunk to cover just 4.2 million square kilometers.That's 38 percent less area than the average cover at that
time of year. And it's a very large 23 percent below the previous record low,which was set just 2 years ago.
This continuing trend has made scientists concerned.
There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer（海洋学家）at the
University of Washington at Seattle.Unusually strong winds blew through the Arctic last summer. The winds
pushed much of the ice out of the central Arctic,leaving a large area of thin ice and open water.
Scientists also suspect that fewer clouds cover the Arctic now than in the past.Clearer skies allow more
sunlight to reach the ocean.The extra heat warms both the water and the atmosphere.In parts of the Arctic
Ocean last year,surface temperatures were 3.5℃warmer than average and 1.5℃warmer than the previous
record high.
With both air and water getting warmer,the ice is melting from both above and below. In some parts of
the Beaufort Sea,north of Alaska and western Canada,ice that measured 3.3 meters thick at the beginning
of the summer measured just 50 centimeters by season's end.
The new measurements suggest that melting is far more severe than scientists have seen by just looking
at ice covcrfrom above,says Donald K. Perovich,a geophysicist at the U.S.Army Cold Regions Research
and Engineering Laboratory in Hanover,N.H.
Some scientists fear that the Arctic is stuck in a warming trend from which it may never recover.The Beaufort Sea mentioned in Paragraph 7 is an example to show_________.
A:how acetirate the new measurements are
B:how thick the ice is in it
C:how serious the problem of the ice melt in the Arctic is
D:how dangerous it is to travel to it答案：C解析：build在此处是“增长，扩大”的意思。expand有“扩张”的意思，所以与build含义相符。
根据第四段第二句可知答案。
第五段的最后一句话和第六段的第一、二句话说明了科学家们推测的冰川融化的原因：一为强风，二为较少的云。
短文第七段举例说明在一个夏天冰层可以以令人难以置信的速度巡逗融化。
短文最后一句提到，一些科学家担心北极已经陷人可能永远无法恢复的变暖趋势之中。第二篇 本文主要讲述了两个失聪的青少年之间的故事。 -
第15题：
共用题干
第一篇
Arctic Melt
Earth’s North and South Poles are famous for being cold and icy.Last year,however,the amnount of ice
in the Arctic Ocean（北冰洋）fell to a record low.
Normally,ice builds in Arctic waters around the North Pole each winter and shrinks（缩小）during the
summer. But for many years,the amount of ice left by the end of summer has been declining.
Since 1979,each decade has seen an 11.4 percent drop in end?of-summer ice cover. Between 1981 and
2000,ice in the Arctic lost 22 percent of its thickness,becoming I.13 meters thinner.
Last summer,Arctic sea ice reached its thinnest levels yet.By the end of summer 2007,the ice had
shrunk to cover just 4.2 million square kilometers.That's 38 percent less area than the average cover at that
time of year. And it's a very large 23 percent below the previous record low,which was set just 2 years ago.
This continuing trend has made scientists concerned.
There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer（海洋学家）at the
University of Washington at Seattle.Unusually strong winds blew through the Arctic last summer. The winds
pushed much of the ice out of the central Arctic,leaving a large area of thin ice and open water.
Scientists also suspect that fewer clouds cover the Arctic now than in the past.Clearer skies allow more
sunlight to reach the ocean.The extra heat warms both the water and the atmosphere.In parts of the Arctic
Ocean last year,surface temperatures were 3.5℃warmer than average and 1.5℃warmer than the previous
record high.
With both air and water getting warmer,the ice is melting from both above and below. In some parts of
the Beaufort Sea,north of Alaska and western Canada,ice that measured 3.3 meters thick at the beginning
of the summer measured just 50 centimeters by season's end.
The new measurements suggest that melting is far more severe than scientists have seen by just looking
at ice covcrfrom above,says Donald K. Perovich,a geophysicist at the U.S.Army Cold Regions Research
and Engineering Laboratory in Hanover,N.H.
Some scientists fear that the Arctic is stuck in a warming trend from which it may never recover.Which of the following is closest in meaning to the word"build"in the first sentence of thesecond paragraph?
A:Construct.
B:Establish.
C:Create.
D:Expand.答案：D解析：build在此处是“增长，扩大”的意思。expand有“扩张”的意思，所以与build含义相符。
根据第四段第二句可知答案。
第五段的最后一句话和第六段的第一、二句话说明了科学家们推测的冰川融化的原因：一为强风，二为较少的云。
短文第七段举例说明在一个夏天冰层可以以令人难以置信的速度巡逗融化。
短文最后一句提到，一些科学家担心北极已经陷人可能永远无法恢复的变暖趋势之中。第二篇 本文主要讲述了两个失聪的青少年之间的故事。 -
第16题：
If global warming goes on like this, Maldives in the Indian Ocean __________ in the century.to come.A.disappears
B.disappeared
C.has disappeared
D.is going to disappear答案：D解析：考查动词时态。句意为“如果全球变暖像现在这样持续下去的话，那么在印度洋的马尔代夫将会在未来的世纪消失”。be going to“将要”，表将来。故选D。 -
第17题：
单选题In securing deck loads for an ocean tow，drill pipe should be（）.Agalvanized to protect against corrosion
Bheld in place with heavy materials such as spare pendant wire
Climited to no more than five courses high
Dprovided with bulwarks at both ends of their bays
正确答案： A解析： 暂无解析 -
第18题：
单选题The first indications a mariner will have of the approach of a warm front will be （）.Alarge cumulonimbus (thunderclouds) building up
Bhigh cirrus clouds gradually changing to cirrostratus and then to altostratus
Cfog caused by the warm air passing over the cooler water
Dlow dark clouds accompanied by intermittent rain
正确答案： B解析： 暂无解析 -
第19题：
问答题Practice 5 The world's oceans are slowly getting more acidic, say scientists. The researchers from California say the change is taking place in response to higher levels of carbon dioxide in the atmosphere. The lowering of the waters' pH value is not great at the moment but could pose a serious threat to current marine life if it continues, they warn. Ken Caldeira and Michael Wickett, from the Lawrence Livermore National Laboratory, report their concerns in the journal Nature. Increasing use of fossil fuels means more carbon dioxide is going into the air, and most of it will eventually be absorbed by seawater. Once in the water, it reacts to form carbonic acid. Scientists believe that the oceans have already become slightly more acidic over the last century. But these researchers have tried to predict what will happen in the future by combining what we know about the history of the oceans with computer models of climate change. "This level of acidity will get much more extreme in the future if we continue releasing CO2 into the atmosphere," said Dr Caldeira. "And we predicted amounts of future acidity that exceed anything we saw over the last several hundred million years, apart from perhaps after rare catastrophic events such as asteroid impacts." If carbon dioxide release continues unabated, ocean pH could be reduced by as much as 0.77 units, the authors warn. It is not absolutely clear what that means for marine life, however. Most organisms live near the surface, where the greatest pH change would be expected to occur, but deep-ocean lifeforms may be more sensitive to pH changes. Coral reefs and other organisms whose skeletons or shells contain calcium carbonate may be particularly affected, the team speculate. They could find it much more difficult to build these structures in water with a lower pH. In recent years some people have suggested deliberately storing carbon dioxide from power stations in the deep ocean as a way of curbing global warming. But Dr Caldeira said that such a strategy should now be re-considered. "Previously, most experts had looked at ocean absorption of carbon dioxide as a good thing — because in releasing CO2 into the atmosphere we warm the planet; and when CO2 is absorbed by the ocean, it reduces the amount of greenhouse warming.正确答案：
【参考译文】
科学家们说世界上的海洋正在慢慢变“酸”。
来自加利福尼亚的研究人员称这种变化是由于大气中二氧化碳含量过高造成的。
他们警告说,目前海水pH值下降还不是非常严重,但是如果继续下降的话会对现存的海洋生物造成严重的威胁。
来自美国罗兰士利弗摩亚国家实验室的肯·卡尔代罗和迈克尔·维克特在《自然》杂志上提出了他们对此事的关注。
越来越多的石油消耗意味着更多的二氧化碳被排放到空气中,而且大部分最终将被海水吸收。二氧化碳一旦进入水中,就会发生反应形成碳酸。
科学家们认为海洋的酸性已经比上个世纪稍微大了一点。
这些研究者们结合所知的海洋历史以及气候变化的电脑模型,试图预测将来的变化。
“如果我们继续向大气中排放二氧化碳的话,将来的酸性浓度会远远超标。”卡尔代罗博士说。
“而且我们估计将来酸的总量会比过去几亿年中人类所见到的任何东西都大,更不用说可能发生类似小行星撞击地球等罕见的大灾难之后了。”
研究者们警告说,如果不减少二氧化碳的排放量,海洋的pH值可能会降低0.77个单位。
尽管这对海洋生命来说意味着什么还不是很清楚。
大多数生物生活在海洋表面,而海洋表面正是pH值预期变化最大的地方,但是深海生物可能对pH值的变化更加敏感。
研究组推测,珊瑚礁和其它骨架或外壳中含有碳酸钙的生物受到的影响可能会格外明显,在pH值较低的水域中它们很难形成这些结构。
最近的几年中,有人蓄意建议将发电站释放的二氧化碳储藏到深海中,以此来抑制全球变暖。
但是卡尔代罗博士说现在应该重新考虑这种策略。
“以前,大多数专家都将海洋吸收二氧化碳看作一件好事——因为将二氧化碳释放到大气中会使大气变暖,然而当二氧化碳被海洋吸收后,温室效应就会降低。”解析： 暂无解析 -
第20题：
单选题Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.Aclearing weather
Bthat a warm front has passed
Cprobable thunderstorm activity
Dan approaching hurricane or typhoon
正确答案： B解析： 暂无解析 -
第21题：
单选题Which of the following statements concerning frontal movements is TRUE（）.AThe temperature rises after a cold front passes
BThe barometric pressure rises when a warm front passes
CA cold front generally passes faster than a warm front
DA warm front usually has more violent weather associated with it than a cold front
正确答案： A解析： 暂无解析 -
第22题：
单选题A sufficient amount of chain must be veered when anchoring a vessel to ensure（）.Athe vessel has enough room to swing while at anchor
Bthe anchor flukes bite into the ocean bottom
Cthere is sufficient weight from the anchor and chain to prevent dragging
Dthere is more chain out than there is in the chain locker
正确答案： B解析： 暂无解析 -
第23题：
单选题In the Northern Hemisphere the major ocean currents tend to flow（）.Aclockwise around the North Atlantic and North Pacific Oceans
Bclockwise or counterclockwise depending on whether it is warm or cold current
Ccounterclockwise except in the Gulf Stream
Dcounterclockwise around the North Atlantic and North Pacific Oceans
正确答案： D解析： 暂无解析