问题 单项选择题

已知某工程双代号网络计划的计划工期等于计算工期,且工作M的开始节点和完成节点均为关键节点,下列关于工作M说法正确的是()。

A.为关键工作

B.总时差等于自由时差

C.自由时差为零

D.总时差大于自由时差

答案

参考答案:B

解析:因为工作M的完成节点为关键节点,则该工作的紧后工作中必有一项是关键工作。如果该工作的完成节点是终点节点,那么其总时差就等于该工作的自由时差,就是时标网络图中波形线的长度。如果该工作的完成节点非终点节点,那么该工作的总时差等于其紧后工作的总时差与该工作自由时差的最小值。该工作紧后工作总时差的最小值是0,所以该工作的总时差等于自由时差。

阅读理解

三、阅读理解(40%)

A

February has long been a month of romance. With the sweet smell of roses in the air, romantic films hit cinemas and love stories fill newspapers and magazines.

   On the 14th day, it is a custom for a boy to take his girlfriend out to dinner, buy her flowers and chocolates, write poems, sing to her or even spell out her name with rose petals! This is what you see on Valentine’s Day, a day named after Valentine who was a priest in the third century Rome. When the emperor decided that single men could become better soldiers than those with wives, he didn’t allow marriage.

   But Valentine continued to perform marriage ceremonies for young lovers in secret. When his actions were discovered, the emperor sentenced him to death. While in prison, it is said that Valentine fell in love with the daughter of his prison guard. Before his death, he wrote her a letter, which he signed “From your Valentine”, an expression that is still in use today. Valentine died for what he believed in and so he was made a Saint (圣徒), as well as becoming one of history’s most romantic characters.

   Nowadays, Valentine’s Day is also popular among Chinese young people. Some students are planning to make Valentine’s cards for parents, teachers and friends. Others want to hold parties at which they will exchange small gifts and eat heart-shaped cakes. The idea is to have fun and encourage people to share in the spirit of St. Valentine.

51. Which of the following is not a custom for a boy to do on Valentine’s Day?

   A. to take his girlfriend out to dinner

   B. to buy his girlfriend flowers and chocolates     

   C. to make Valentine’s cards for teachers and friends

   D. to spell out his girlfriend’s name with rose petals

52. Why did the emperor in Rome not allow marriage in his country?

   A. Because there were few women in his country at that time.

   B. Because he thought men without wives could be better soldiers.

   C. Because there wasn’t enough food for so many people.

   D. Because he wanted to control the birth rate.

53. Valentine was put into prison because ______.

   A. he killed one of the soldiers              B. he stole a lot of food

   C. he didn’t obey the emperor’s order        D. he didn’t want to be a soldier

54. The last paragraph mainly tells us ______.

   A. students in China send cards to their teachers

   B. it is a good idea to celebrate Valentine’s Day in China

   C. it is interesting to celebrate Valentine’s Day in China

   D. Valentine’s Day is also popular in China now

单项选择题