问题 单项选择题

某项目完成估计需要12个月。在进一步分析后认为最少将花8个月,最糟糕的情况下将花28个月。那么,这个估计的PERT值是()个月。

A.9

B.11

C.13

D.14

答案

参考答案:D

解析:根据公式:PERT估算的活动历时均值=(悲观估计值+4最可能估计值+乐观估计值)/6估计该项目完成的时间为(8+4×12+28)/6=14个月。

阅读理解

阅读理解。

     Frederic Chopin was born in March 1810 near Warsaw in Poland (波兰). He was one of the greatest

musicians in the world. In 1831, he went to Paris. No people but he could play the piano very well.

     At that time people in Paris liked the Hungarian (匈牙利的) pianist Franz Liszt.

     One night, at a concert, Liszt went to the piano and people shouted. As all the lights in the concert

were turned off, a wonderful piano concert started. The music was so good that the listeners were all

greatly interested. They kept praising (不停地赞扬) the pianist and thought that Liszt had reached

something new in playing the piano.

     Suddenly, all the lights were turned on again as the music came to an end. And there stood a young

man instead of the famous Hungarian pianist Franz Liszt.

     Liszt planned all this. As the lights went out, Liszt left his chair and let Chopin take his place. So with

the help of Liszt and his own talent (天赋), Chopin soon became famous.

1. Chopin was _____.

A. the greatest musician in the world

B. a famous Polish (波兰的) pianist

C. a famous Paris pianist

D. one of the greatest musicians in Hungary

2. The wonderful piano concert started _____.

A. after all the lights were turned on

B. when Liszt sat down at the piano

C. after the lights were turned off

D. when Chopin went to the piano

3. When the music came to an end, _____.

A. Liszt stood at the piano

B. all the lights were turned off again

C. Chopin stood at the piano

D. people went out of the hall

4. Chopin became famous _____.

A. before he came to the concert

B. because he was a student of Liszt's

C. because people in Paris liked him very much

D. since he played so well at the concert

5. From the story we know _____.

A. Chopin could be famous because of his own talent and the help from Liszt

B. Liszt planned to make Chopin famous

C. Liszt was Chopin's teacher

D. one could be famous only with the help of a famous pianist

单项选择题