问题 多选题

一定质量的理想气体由状态A变化到状态B,压强随体积变化的关系如图,这个过程(  )

A.气体的密度一直变小

B.气体的温度一直降低

C.气体一直对外界做功

D.气体一直向外界放热

答案

A、一定质量的理想气体由状态A变化到状态B过程,体积增大,密度一直变小.故A正确.

B、气体发生等压变化,体积增大,根据盖?吕萨克定律分析得知,温度升高.故B错误.

C、气体体积增大,一直对外做功,故C正确.

D、温度升高,气体的内能增大,对外做功,由热力学第一定律分析得知,气体一直从外界吸热.故D错误.

故选AC.

单项选择题

In the 1960s, medical researchers Thomas Holmes and Richard Rahe developed a checklist of stressful events. They appreciated the tricky point that any major change can be stressful. Negative events like "serious illness of a family member" were high on the list, but so were some positive life-changing events, like marriage. When you take the Holmes-Rahe test you must remember that the score does not reflect how you deal with stress—it only shows how much you have to deal with. And we now know that the way you handle these events dramatically affects your chances of staying healthy.

By the early 1970s, hundreds of similar studies had followed Holmes and Rahe. And millions of Americans who work and live under stress worried over the reports. Somehow, the research got boiled down to a memorable message. Women’s magazines ran headlines like "Stress causes illness. " If you want to stay physically and mentally healthy, the articles said, avoid stressful events.

But such simplistic advice is impossible to follow. Even if stressful events are dangerous, many—like the death of a loved one—are impossible to avoid. Moreover, any warning to avoid all stressful events is a prescription (处方)for staying away from opportunities as well as trouble. Since any change can be stressful, a person who wanted to be completely free of stress would never marry, have a child, take a new job or move.

The notion that all stress makes you sick also ignores a lot of what we know about people. It assumes we’re all vulnerable (脆弱的) and passive in the face of adversity (逆境). But what about human initiative and creativity Many come through periods of stress with more physical and mental vigor than they had before. We also know that a long time without change or challenge can lead to boredom, and physical and mental strain.

The result of Holmes-Rahe’s medical research tells us ().

A. the way you handle major events may cause stress

B. what should be done to avoid stress

C. what kind of event would cause stress

D. how to cope with sudden changes in life

单项选择题 案例分析题