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The velocity of the apparent wind can be more than the true wind,and come from the same di

题目

The velocity of the apparent wind can be more than the true wind，and come from the same direction，if certain conditions are present．One condition is that the ______．

A.Ship's speed must be less than the true wind velocity

B.True wind must be from dead astern

C.True wind velocity must be faster than the ship's speed

D.True wind must be from dead ahead

参考答案和解析
正确答案：D
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相似问题和答案

第1题：

If the current and wind are in the same direction，the sea surface represents a wind speed ______.

A.lower than actually exists

B.higher than actually exists

C.that actually exists

D.that has no proportional relationship


正确答案：A

第2题：

A weather forecast states that the wind will commence backing. In the Northern Hemisphere this would indicate that it will ______.

A.shift in a clockwise manner

B.shift in a counterclockwise manner

C.continue blowing from the same direction

D.decrease in velocity


正确答案：B
气象预报中叙述的风将开始风向反转。在北半球这表示风向将反时针方向变化

第3题：

At sea the wind can ______ giant, powerful waves.

A. build up

B. stand up

C. come up

D. draw up


参考答案：A

第4题：

共用题干
第一篇

Renewable Energy Sources

Today petroleum（石油）provides around 40% of the world's energy needs, mostly
fuelling automobiles.Coal is still used,mostly in power stations,to cover one-quarter of our
energy needs,but it is the least efficient,unhealthiest and most environmentally damaging
fossil fuel（矿物燃料）.Natural gas reserves could fill some of the gap from oil,but reserves
of that will not last into the 22nd century either. Most experts predict we will exhaust easily
accessible reserves within 50 years.Less-polluting renewable energy sources offer a more
practical long-term energy solution."Renewable"refers to the fact that these resources are
not used faster than they can be replaced.
Hydroelectric（水力发电的）power is now the most common form of renewable energy,
suDDIvina around 20%of world electricity.China's Three Gorges Dam is the largest ever.
At five times the size of the US's Hoover Dam, its 26 turbines（涡轮机）will generate the
equivalent energy of 18 coal-fired power stations.It will satisfy 3% of China's entire
electricity demand.
In 2003. the first commercial power station to use tidal（潮汐的）currents in the open
sea opened in Norway. It is designed like windmill（风车）,but others take the torm of
turbines.
As prices fall,wind power has become the fastest growing type of electricity
generation一quadrupling（翻两番）worldwide between 1999 and 2005. Modern wind farms
consist of turbines that generate electricity.Though it will be more expensive,there is more
than enoucih wind to provide the world's entire energy needs.Wind farms come in onshore
and offshore forms.They can often end up at spots of natural beauty,and are often
unpopular with residents.And turbines are not totally harmless一they can interfere with radar,
alter climate and kill sea birds.Scotland is building Europe's largest wind tarm,wnicn will
power 200.000 homes.The UK's goal is to generate one-fifth of power from renewable
sources,mainly wind,by 2020.But this may cause problems,because wind is unreiiable.

According to the passage,resources like wind are
A:renewable.
B:recyclable.
C:damaging.
D:scarce.

答案：A
解析：

第5题：

An anemometer on a moving vessel measures ______.

A.apparent wind speed only

B.true wind speed and true wind direction

C.true wind speed only

D.apparent wind speed and true wind direction


正确答案：A
在运动的船上的风速计仅测量视风（相对风）速。

第6题：

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


正确答案：B

第7题：

A wind vane on a moving vessel shows ______.

A.dead reckoning wind direction

B.true wind direction

C.apparent wind direction

D.estimated wind direction


正确答案：C
运动的船上的风向标指示视风的方向。

第8题：

You need to replicate a table from a master to a slave. The master and slave copies of the table will have different number of columns.Which two conditions must be true?()

A.Each extra column in the copy with more columns must not have a default value

B.Columns that are common to both versions of the table must be defined in the same order on the master and the slave

C.The slave database cannot have more columns than the master. Only the master database can have more columns

D.Columns that are common to both versions of the table must come first in the table definition, before any additional columns are additional columns are defined on either server

E.The master database cannot have more columns than the slave. Only the slave deatbase can have more columns


参考答案：B, D

第9题：

Apparent wind speed blowing across a vessel under tow can be measured by a(n)______．

A.barometer

B.wind vane

C.anemometer

D.Thermometer


正确答案：C
视风是通过安装在船上的风速仪测得的。

第10题：

共用题干
第一篇

Renewable Energy Sources

Today petroleum（石油）provides around 40% of the world's energy needs, mostly
fuelling automobiles.Coal is still used,mostly in power stations,to cover one-quarter of our
energy needs,but it is the least efficient,unhealthiest and most environmentally damaging
fossil fuel（矿物燃料）.Natural gas reserves could fill some of the gap from oil,but reserves
of that will not last into the 22nd century either. Most experts predict we will exhaust easily
accessible reserves within 50 years.Less-polluting renewable energy sources offer a more
practical long-term energy solution."Renewable"refers to the fact that these resources are
not used faster than they can be replaced.
Hydroelectric（水力发电的）power is now the most common form of renewable energy,
suDDIvina around 20%of world electricity.China's Three Gorges Dam is the largest ever.
At five times the size of the US's Hoover Dam, its 26 turbines（涡轮机）will generate the
equivalent energy of 18 coal-fired power stations.It will satisfy 3% of China's entire
electricity demand.
In 2003. the first commercial power station to use tidal（潮汐的）currents in the open
sea opened in Norway. It is designed like windmill（风车）,but others take the torm of
turbines.
As prices fall,wind power has become the fastest growing type of electricity
generation一quadrupling（翻两番）worldwide between 1999 and 2005. Modern wind farms
consist of turbines that generate electricity.Though it will be more expensive,there is more
than enoucih wind to provide the world's entire energy needs.Wind farms come in onshore
and offshore forms.They can often end up at spots of natural beauty,and are often
unpopular with residents.And turbines are not totally harmless一they can interfere with radar,
alter climate and kill sea birds.Scotland is building Europe's largest wind tarm,wnicn will
power 200.000 homes.The UK's goal is to generate one-fifth of power from renewable
sources,mainly wind,by 2020.But this may cause problems,because wind is unreiiable.

One of the problems with wind farms is that
A:there is not enough wind.
B:wind is not reliable.
C:they can only be built on the sea.
D:they might influence the world economy.

答案：B
解析：

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