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问题 选择题

下列说法中，正确的是（　　）

A．射线MP和射线PM表示同一条射线

B．射线MP有两个端点

C．线段AB和线段BA表示同一条线段

D．射线AB和线段AB对应同一图形

答案

A、射线MP和射线PM表示同一条射线错误，故本选项错误；

B、射线MP有一个端点M，故本选项错误；

C、线段AB和线段BA表示同一条线段正确，故本选项正确；

D、射线AB和线段AB对应同一图形错误；故本选项错误．

故选C．

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) .

（73）处应填（）。

A．use-case modeling

B．class modeling

C．dynamic modeling

D．behavioral modeling
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多选题

如图所示，R1为定值电阻，R2是正温度系数的金属热电阻，L为小灯泡，当温度下降时，（　　）

A．R1两端的电压增大

B．电流表的示数增大

C．小灯泡变亮

D．小灯泡变暗
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