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问题 单项选择题

简易保护接线的变电所35kV侧，阀式避雷器与主变压器或电压互感器间的最大电气距离一般不宜超过( )。

A．5m；
B．10m；
C．15m；
D．20m。

答案

参考答案：B

选择题

若二项式4m2+9加上一个单项式后是一个含m的完全平方式，则这样的单项式共有（　　）

A．2个

B．3个

C．4个

D．5个
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单项选择题

Object-oriented analysis (OOA) is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is (71) . It determines how the various results are computed by the product and presents this information in the form of a (72) . and associated scenarios. The second is (73) , which determines the classes and their attributes; Then determine the interrelationships and interaction among the classes. The last step is (74) , which determines the actions performed by or to each class or subclass and presents this information in the form of (75) .

A. activity diagram B. component diagram
C. sequence diagram D. state diagram
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