问题 问答题

某施工单位编制的某工程网络图,如图3-1所示,网络进度计划原始方案各工作的持续时间和估计费用,见表3-1。

若该网络进度计划各工作的可压缩时间及压缩单位时间增加的费用,如表4.2所示。确定该网络进度计划的最低综合费用和相应的关键路线,并计算调整优化后的总工期(要求写出调整优化过程)。

答案

参考答案:

第一次调整优化:在关键线路上取压缩单位时间增加费用最低的F工作为对象压缩 2天、

增加费用:2×2万元=4万元

第二次调整优化:A、C、H、J与B、F、J同时成为关键工作,选择H工作和F工作为调整对象,各压缩2天。

增加费用:2×(1.5+2)万元=7万元

第二次调整优化:A、C、H、J与B、F、J仍为关键工作,选择A工作和F于作作为凋

整对象,各压缩1天。

增加费用:1×(2+2)万元=4万元

优化后的关键线路为:

①-③-⑥-⑦-⑧(或关键工作为B、F、J)和①-②-④-⑦-⑧(或关键工作为 A、C、H、J)。

工期:(98-2-2-1)天=93天

最低综合费用:(401+4+7+4)万元=416万元

阅读理解

The other day I heard a few local musicians talking:

"I hate all the pianos in this town and I hate that rubbish they play on the radio .They cannot every understand rhythm(韵律)"

"Nobody wants to pay musicians anything. I'm sick of all the people who want you to play without paying you."

One younger musician said, "There are several clubs who want me to play for a few nights a  month and I'm trying to find other places to play .I'm also planning to join in several summer festivals this year."

I  really liked what the younger musician said so I made friends with him.

Attitudes are important. Whether they're positive or negative(消极) they're all rubbing      off on you,If you're around people who are always complaining or blaming others, it is possible that you will start doing the same as well. If you spend lots of time with people who don't support your dreams, it is time to take a look at the people you call " friends".

There is an easy exercise you can try. Make a list of the people who you often stay with, and simply stop , spending time with the negative ones on your list. Set a new standard for yourself and don't become friends with people who fall below that standard.

Of course, this exercise is entirely different from making friends only for the good of oneself. We really should try to help and spend time with those who are working towards a goal or dream.

小题1:The musicians' conversation at the beginning is there to show that

A.musicians' living conditions are not good

B.people in that town have poor taste in music

C.young people are more likely to succeed

D.different musicians have different attitudes小题2:The underlined part in Para. 6 means________.

A.they'll have an influence on you

B.they'll help you realize your dreams

C.they'll keep you from moving on

D.they'll push you ahead very hard小题3:Why did the author want to make friends with the younger musician?

A.He is more active than the others.

B.He can earn more than the others.

C.His attitude is more positive than the others.

D.He has more things to do than the others.小题4:By doing the exercise mentioned in Para. 7, you can________.

A.improve your ability to make friends

B.make the right kind of friends for sure

C.develop a better relationship with your friends

D.make some new friends with similar interests小题5:We can get the following information from the passage EXCEPT________.

A.the younger musician is a positive person and would be a good friend

B.one should avoid making friends with people having lots of difficulties

C.the exercise can help you keep close to really helpful friends

D.one will start complaining if one spends too much time with negative people

填空题