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问题 单项选择题

某工程双代号网络计划如下图所示，其中关键线路有（）条。

A.2 

B.3 

C.4 

D.5

答案

参考答案：B

解析：

在关键线路法（CPM）中，线路上所有工作的持续时间总和称为该线路的总持续时间。总持续时间最长的线路称为关键线路，关键线路的长度就是网络计划的总工期。

考点:工程网络计划技术

问答题 简答题

出钢过程下渣对钢水如何处理？
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单项选择题

Prior to the UML, there was no clear leading (111) language. Users had to choose from among many similar modeling languages with minor differences in overall (112) power. Most of the modeling languages shared a set of commonly accepted concepts that are expressed slightly differently in various languages. This lack of (113) discouraged new users from entering the OO market and from doing OO modeling, without greatly expanding the power of modeling. Users longed for the industry to adopt one, or a very few, broadly supported modeling languages suitable for (114) usage.

Some vendors were discouraged from entering the OO modeling area because of the need to support many similar, but slightly different, modeling languages. In particular, the supply of add-on tools has been depressed because small vendors cannot afford to support many different formats from many different (115) modeling tools. It is important to the entire O0 industry to encourage broadly based tools and vendors, as well as niche products that cater to the needs of specialized groups.

（112）是（）

A.control

B.expressive

C.conductive

D.interactive
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