用熔断器保护的电压互感器回路，可不验算动、热稳定。()

下列句子加粗词语使用正确的一项是[ ]

A．阳春三月，微风还带着寒意。西湖边的垂柳却花枝招展，嫩叶满枝，翩翩起舞，仿佛在迎候来自远方的早春客人。

B．一个人要求得进步，就必须下苦功夫，郑重其事地进行自我修养。

C．四川雅安抗震救灾前线，武警消防官兵首当其冲，克服常人难以想象的困难，及时赶到目的地，开展救援工作。

D．从高空俯视黄山，在一片山水相间的万绿丛中，千峰竞秀，万壑藏云，郁郁葱葱，飞红滴翠。人们怎能不赞叹大自然的鬼斧神工！

混合性呼吸困难见于 （）

A.急性喉炎

B.气管异物

C.阻塞性肺气肿

D.老年性肺气肿

E.肺不张

Electrical devices（仪器）could soon use power make by human energy, Scientists say they have developed an experimental device that produces electricity from the physical movement of a person walking , British scientist Max Donelan and other scientists in Canada and the United States developed the device.

The device connects to a person’s knee, As the person walks, the device captures energy each time the person slows down, To do this ,the device helps with the slowing sown movement of the leg, The movements of the walking person push parts of a small machine that produces electricity, Using the device, an adult walking quickly could produce thirteen watts of electricity in just a minute, Donelan says walking at that speed could produce enough power to operate a laptop computer for six minutes.

There are several possible uses for the device ,Developers say it could help people who work in areas without electricity to operate small computers, The deice could also be used in hospitals to operate heart pacemakers（起博器）,It could even be used to assist in the movement of robotic arms and legs.

The experimental version of the device weighs about one and a half kilograms, but it is too costly for most people to buy, But the researchers hope to make a lighter, less costly version.An improved version should be ready in one year.

The developers hope the device will one day help developing countries, Nearly twenty five percent of people around the world live without electric power.

A similar product was invented in 2005 by Larry Rome of the University of Pennsylvania,He created a bag carried on a person’s back that also produces power from walking, The knee device does not produce as much electricity as the bag ,But the bag requires the walker to carry a load of twenty to thirty kilograms.

小题1:The second paragraph mainly talks about       .

A．who developed the device

B．how the device works

C．several possible uses for the devices

D．how much electricity the device can produce小题2:What is the disadvantage of the experimental version of the device?

A．It is too heavy for the walker to bear

B．It is too complex for people to use

C．It is too expensive for most people to afford

D．It will slow down one’s walking speed.小题3:Compared with the device designed by Larry Rome ,this new device       .

A．produces power without adding more loads to the walker

B．can produce more power in a much shorter time

C．needs to be equipped with a battery

D．can help the walker walk faster小题4:From the passage, we can learn that the electrical device can       .

A．help housewives operate the washing machine

B．make it much easier for us to go online

C．produce more electricity than that invented by Larry Rome

D．be applied in medicine to operate heart pacemakers小题5:What would be the best title for the passage?

A．First device powered by walking will soon be on the market

B．Advanced technology brings in a new way to operate heart pacemakers

C．Device gives new meaning to the idea of power walking

D．Human energy will become a main source of electricity

关于摩擦力下列说法错误的是[ ]

A、缝衣针表面做得很光滑是为了减少摩擦力

B、摩擦力的大小有时与物体的重力大小无关

C、鞋底上的花纹是为了增大鞋底与地面间的摩擦力

D、摩擦力总是阻力，它一定要阻碍物体的运动

建设工程的总进度目标指的是整个项目的进度目标，它是在( )项目定义时确定的，项目管理的主要任务是在项目的实施阶段对项目的目标进行控制。

A．项目开工阶段

B．项目决策阶段

C．项目完工阶段

D．项目投资阶段