试题与答案

血清脂蛋白电泳可分α-脂蛋白、前β-脂蛋白、β-脂蛋白及乳糜微粒四个条带,α-脂蛋白

题型:单项选择题 A1/A2型题

题目:

血清脂蛋白电泳可分α-脂蛋白、前β-脂蛋白、β-脂蛋白及乳糜微粒四个条带,α-脂蛋白中所含的载脂蛋白是()

A.载脂蛋白A

B.载脂蛋白B

C.载脂蛋白C

D.载脂蛋白D

E.载脂蛋白E

答案:

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题型:问答题

如图(a)所示是电饭煲的电路图,是一个限温开关,手动闭合,当此开关的温度达到居里点(103℃)时会自动断开,是一个自动温控开关,当温度低于70℃时会自动闭合,温度高于80℃时会自动断开,红灯是加热状态时的指示灯,黄灯是保温状态时的指示灯,限流电阻=500Ω,加热电阻丝=50Ω,两灯电阻不计.

(1)根据电路分析,叙述电饭煲煮饭的全过程(包括加热和保温过程)

(2)简要回答,如果不闭合开关,电饭煲能将饭煮熟吗?

(3)计算加热和保温两种状态下,电饭煲消耗的功率之比.

(4)电饭煲中的电热部分,是在电路中串联有一个PTC元件,它是一个热敏电阻器,其中电阻率随温度的关系如图(b)所示,由于这种特性,它具有温控功能,使电饭煲自动地处于煮饭和保温状态.对于PTC元件在电饭煲中的作用,以下说法中正确的是[  ]

A.通电后其功率先增大,后减小

B.通电后其功率先减小,后增大

C.当其产生的热量与散发的热量相等时,温度保持在不变

D.当其产生的热量与散发的热量相等时,温度保持在的某一值不变 

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题型:阅读理解

Climate change experts from the Tyndall Climate Research Centre in Britain have said urgent action is needed to curb the rapid growth in air travel if the government is to meet its commitments on tackling global warming. This report from Stephen Evans:

Falling ticket prices and rising incomes are leading to rapid growth in global air travel. According to the British government, the number of British air passengers, for example, will more than double in the next quarter of a century. Increases of such an order would mean much more aviation fuel being burned and aviation fuel may be more harmful to the environment than other fuels because the resulting smoke is emitted at high altitudes.

A group of scientists at the environmental research group, the Tyndall Centre, says that if Britain is to meet its overall target for cutting damaging emissions, other uses of fuel like for heating homes or driving cars would have to be cut dramatically.

The British government wants the use of aviation fuel covered by international agreement on the environment. The difficulty for any individual government is that taxing fuel used at its own airports might push airlines to move their operations to competing airports in other countries.

小题1:Which statement is TRUE?

A.A lot of people around the world have recently stopped flying because they have less money to spend and the price of plane tickets is going up

B.Half as many people as today will fly in the next 25 years.

C.Because more planes are suing more flight petrol and more pollution is being produced in the sky.

D.The British government would like all countries to agree not to tax airline fuel.小题2:Which is the reason that leads to the rapid growth in global air travel?

A.The increase of incomes and the decrease of ticket prices.

B.The growth of the number of good planes.

C.The falling of the oil price.

D.The encouragement of the governments.小题3:The Tyndall Centre says ________.

A.the number of British air passengers will more than double in the next quarter of a century.

B.Britain will have to use less energy at home and on the roads to meet the goal of cutting pollution.

C.If airports are taxed for using fuel by each country’s government, then airlines might use other airports with cheaper fuel taxes.

D.Only the use of aviation fuel needs to be cut down to meet the overall target for cutting damaging emissions.小题4:What’s the best title of the text?

A.Falling Ticket Prices and Rising Incomes

B.Growth in Air Travel Harms Environment

C.Rapid Growth in Global Air Travel

D.More Flight Petrol, More smoke

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