以淀粉胶、琼脂或琼脂糖凝胶、聚丙烯酰胺凝胶等作为支持介质的区带电泳法称为() A.等

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问题:

以淀粉胶、琼脂或琼脂糖凝胶、聚丙烯酰胺凝胶等作为支持介质的区带电泳法称为()

A.等电聚焦电泳

B.毛细管电泳

C.凝胶电泳

D.醋酸纤维素薄膜电泳

E.硝酸纤维素薄膜电泳

考点:临床医学检验技术士临床检验士基础知识初级临床医学检验技士基础知识
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生态系统服务指人类从生态系统获得的所有惠益,具体内容不包括()

A.供给服务

B.调节服务

C.社会服务

D.文化服务

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如图,小木块在倾角为300的斜面上受到与斜面平行向上的恒定外力F作用,从A点由静止开始做匀加速运动,前进了0.45m抵达B点时,立即撤去外力,此后小木块又前进0.15m到达C点,速度为零.已知木块与斜面动摩擦因数μ=

3
3
/6,木块质量m=1kg.求:

(1)木块在BC段加速度的大小;

(2)木块向上经过B点时速度大小;

(3)木块在AB段所受的外力F大小.( g=10m/s2

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一本故事书有254页,李伟第一天看了48页,第二天看了52页,还有多少页没读?

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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

题型:单项选择题

分部运行前机车乘务员应使遗留车辆处于制动保压状态并()进行防溜。

A.拧紧两端车辆的人力制动机并在两端放置铁鞋

B.拧紧两端车辆的人力制动机

C.拧紧一端车辆的人力制动机

D.在一端放置铁鞋

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