问题 问答题 简答题

简述SD结构模型地建模步骤。

答案

参考答案:

1.明确系统边界,即确定对象系统地范围

2.阐明形成系统结构地反馈回路,即明确系统内部活动地因果关系链

3.确定反馈回路中的水准变量和速率变量

4.阐明速率变量的子结构或完善、形成各个决策函数,建立起SD结构模型(流图)

改错题

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第二节短文改错 (共10小题;每小题1.5分,满分15分)

此题要求改正所给短文中的错误。对标有题号的每一行做出判断∶

 如无错误,在该行右边横线上画一个勾(√);如有错误(每行只有一个错误), 则按下列情况改∶该行多一个词∶ 把多余的词用斜线(\)划掉, 在该行右边横线上写出该词,并也用斜线划掉。

  该行缺一个词∶ 在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。

  该行错一个词∶ 在错的词下划一横线,在该行右边横线上写出改正后的词。

注意∶ 原行没有错的不要改。

My classmate, Joseph, is at present in hospital                

with a breaking leg. He was walking to school the other                76._________

day when a bicycle run into him. He never watches                          77._________

where he is going, so he often gets into the trouble.                   78._________

But he is having a nice time there. He has a comfortable                79__________

room, patiently nurses, and a great deal of time to read.                80._________

Some friends of her go to see him every day, and they take             81._________

him lots of good books and fresh fruit. He is not lost any time          82._________

from school because he is busy study what he has                     83._________

missed in class. The doctor says he is recovering fast than              84._________

expected and will be out of hospital a few weeks.                    85._________

选择题