问题 问答题

简述原子吸收分析法的基本原理。

答案

参考答案:由一种特制的光源(元素的空心阴极灯)发射出该元素的特征谱线(具有确定波长的光),特征谱线通过将试样转变为气态自由原子的火焰或电加热设备时,则被待测元素的自由原子所吸收,产生吸收信号。所测得的吸光度的大小与试样中该元素的含量成正比。

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第二节(共5小题;每小题2分,满分10分)

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两项为多余

选项。

When I was a little girl, my mom would say, “Half the fun of doing anything is sharing it with others.”   71  Friends and mates allow us to enjoy our successes and our joys, comfort us in our hard moments, and provide a mirror for us to learn more about ourselves. I’ve always looked at friends as the family we choose. They enrich our lives. As Robert Louis Steven once said, “  72 

To be a good friend or partner, it’s important to be a good listener. Hear what your friend or mate has to say first rather than jump to conclusions or get defensive.   73 When they hear their words repeated back to them, it can help them to realize what they said was not exactly what they meant to say.

  74  You know the old golden rule, “Care for others the way you would like them to care for you.” The support of a friend during a tough time could make the difference between success and failure. Encouragement and confidence are the gifts that can help change a person’s life.

Take care, though, with whom you choose to have close relationship, for they can have a great effect on yourself – respect and life path. As someone once told me “  75 They will either take you up or down.”

A.I am afraid so.

B.It is quite true

C.Friendship is the most important factor.

D.Sometimes it is useful to be their mirror. E.A friend is a present which you give yourself.      

F.The attitudes of your friends are like the buttons on a lift.

G.Patience, sympathy and understanding are also important qualities.

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