(1)人眼的晶状体和角膜的共同作用相当于凸透镜,如图所示是眼睛看物体时的光路图,

题型:填空题

问题:

(1)人眼的晶状体和角膜的共同作用相当于凸透镜,如图所示是眼睛看物体时的光路图,要使视网膜上成清晰的像,须用_____________透镜矫正(选填“凸”或“凹”);

(2)校医务室检查视力时,因房间太小而使用一个平面镜,让学生看视力表在平面镜中所成的像。视力表到镜子的距离为2.8m,视力表的像到平面镜的距离为        m,如图所示,而体检要求人与视力表距离应为5m,则该同学所在位置距镜子的距离应为         m。

考点:近视眼及其矫正平面镜成像的特点和原因
题型:填空题

There was a young man named Bill in England. Before leaving school, he began to look for a job. Few companies needed new clerks due to the financial crisis(金融危机)at that time. It became harder and harder to find a job. Luckily, a chance camp up to him. A company wanted to employ(雇用)one person. He and the other twenty people joined in the first interview(面试). After that, three persons were allowed to enter the final test which would decide one person to be employed in the end. Bill was lucky to be among them. On the day of the second interview, Bill and the others arrived at the company on time. To their surprise, the interview was very easy. The interviewer only had a free talk with them, and then asked them to go back home waiting for the result. The next morning, Bill received a letter from the company which said he wasn't accepted. Certainly, he felt disappointed. On the evening of that day, Bill surprisingly received another letter, which said he was employed. But why was he accepted? As a matter of fact, the first letter sent to Bill was also part of the test. Every one of them got a letter which had the same meaning that morning. Only Bill replied with “Thank you” while the others said nothing.

Life isn’t all fun. There is always something making us unhappy. When you feel disappointed, please say “Thank you” to the person who disappoints you. That shows your great generosity(宽容) and politeness to others. If you do so, you’ll have more chances than others. 

根据短文内容判断正(A)、误(B)。

小题1:Bill was a student during the financial crisis.

小题2:Twenty people wanted to get the job.

小题3:Bill felt surprised when he received the second letter.

小题4:All the three people were employed by the company.

小题5:From the passage, we know that to be generous and polite can help you get more chances.

题型:填空题

关于共振频率的叙述哪一种是错误的()

A.是产生磁共振现象的必要条件

B.当射频脉冲频率与质子进动频率相同称共振频率

C.共振频率的脉冲可以使纵向磁场发生偏转

D.共振频率随磁场强度变化而变化

E.共振频率与成像质子的种类无关

题型:填空题

             ,the idea of having to work under a woman defeated him.

A.Wanting the job very much

B.Although wanting the job badly

C.Though he wanted the job very much

D.He wanted the job badly

题型:填空题

宫口于产后7日仍可容2指。

题型:填空题

()下,企业注重了解需求,满足需求,产品不需要最优而是最合适。

A.产品导向

B.消费导向

C.需求导向

D.生产导向

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