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If the current and wind are in opposite directions，the sea surface represents ______.
A.a greatly reduced wind speed
B.a higher wind speed than what really exists
C.a lower wind speed than what really exists
D.more turbulent winds
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更多 “ If the current and wind are in opposite directions，the sea surface represents ______.A.a greatly reduced wind speedB.a higher wind speed than what really existsC.a lower wind speed than what really existsD.more turbulent winds ” 相关考题
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第二篇Hurricane（咫风）KatrinaA hurricane is a fiercely powertul , rotating（旋转的）form of tropical storm that can be 124 to 1,240 miles in diameter. The term hurricane is derived from Hurican,the name of a native American storm god.Hurricanes are typical of a calm central region of low pressure between 12 to 60 miles in diameter,known as the eye.They occur in tropical regions. Over its lifetime,one of these storms can release as much energy as 10,000 nuclear bombs.The seed for hurricane formation is a cluster（聚集）of thunderstorms over warm tropical waters.Hurricanes can only form and be fed when the sea-surface temperature exceeds 27℃ and the surrounding atmosphere is calm.These requirements are metbetween June and November in the northern part of the world.Under these conditions, large quantities of water evaporate（蒸发）and condense（冷凝）into clouds and rain-releasing heat in the process.It is this heat energy,combined with the rotation of the Earth,that drives a hurricane.When the warm column of air from the sea surface first begins to rise,it causes an area of low pressure.This in turn creates wind as air is drawn into the area.This spinning wind drags up more moist air from the sea surface in a process that strengthens the storm.Cold air falls back to the ocean surface through the eye and on the outside of the storm.Initially,when wind speeds reach 23 miles per hour,these mild,wet and grey weather systems are known as depressions,or low air pressure.Hurricane Katrina formed in this way over the south-eastern Bahamas on 23 August 2005.Katrina has had a devastating impact on the Gulf Coast of the US,leaving a disaster zone of 90,000 square miles in its wake（尾迹）一almost the size of the UK. Thousands have been killed or injured and more than half a million people have become homeless in a humanitarian（人道主义的）crisis of a scale not seen in the US since the Great Depression.The cost of the damage may top $100 billion.When the warm air from the sea surface begins to rise,itA:creates an area of low pressure.B:supplies cold air to the eye of a hurricane.C:increases the sea-surface temperature.D:strengthens the rotation of the earth.
考题
单选题For determining the amount of chains used in anchoring operation,which one of the following factors wouldn’t be considered?（）.A
selection of landmarksB
character of sea bottomC
strength of current and wind forceD
radius of ship swing to wind or tide
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单选题Solid green arrows on the main body of a pilot chart indicate （）.A
prevailing wind directionsB
prevailing ocean current directionsC
probable surface current flowD
shortest great circle routes
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单选题You are docking a vessel．Wind and current are most favorable when they are（）.A
crossing your course in the same directionB
crossing your course in opposite directionsC
parallel to the pier from aheadD
setting you on the pier
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单选题If the current and wind are in the same direction，the sea surface represents a wind speed （）.A
lower than actually existsB
higher than actually existsC
that actually existsD
that has no proportional relationship
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单选题The steady current circling the globe at about 60°S is the（）.A
Prevailing WesterlyB
Sub-Polar FlowC
West Wind DriftD
Humboldt Current
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单选题A sea breeze is a wind（）.A
that blows towards the sea at nightB
that blows towards an island during the dayC
caused by cold air descending a coastal inclineD
caused by the distant approach of a hurricane
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单选题The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.A
temperatureB
densityC
deflectionD
speed
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单选题The average height of the surface of the sea for all stages of the tide over a 19 year period is called（）.A
mean high waterB
mean low waterC
half-tide levelD
mean sea level
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单选题The result of two forces acting in opposite directions and along parallel lines，is an example of what type of stress?（）A
TensileB
CompressionC
ShearD
Strain
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单选题The best time to work a boat into a slip is（）.A
when the wind is against youB
with the current setting against youC
at slack waterD
with a cross current
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单选题When picking up your mooring at the buoy，the correct method is to（）.A
approach the buoy with the wind and current asternB
approach the buoy with the wind and current aheadC
approach the buoy with wind and sea abeamD
stop upwind and up current and drift down on the buoy
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单选题（）is a type of fog occurring close to the sea surface when the air is dry and cold-probably at least 9℃ below the sea surface temperature.A
MIXING FOGB
ADVECTION FOGC
RADIATION FOGD
ARCTIC SEA SMOKE
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单选题The Rules state that certain factors are to be taken into account when determining safe speed. Those factors include（）.A
state of wind，sea，and current，and the proximity of navigational hazardsB
maximum attainable speed of your vesselC
temperatureD
aids to navigation that are available
考题
单选题If the current and wind are in opposite directions，the sea surface represents（）.A
a greatly reduced wind speedB
a higher wind speed than what really existsC
a lower wind speed than what really existsD
more turbulent winds
考题
单选题Your vessel is off a lee shore in heavy weather and laboring. Which action should you take?（）.A
Put the sea and wind about two points on either how and reduce speedB
Heave to in the trough of the seaC
Put the sea and wind on either quarter and proceed at increased speedD
Put the bow directly into the sea and proceed at full speed
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