关于电阻，下列说法中正确的是：[ ] A．绝缘体不容易导电，

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问题选择题

关于电阻，下列说法中正确的是：[ ]

A．绝缘体不容易导电，是因为它们没有电阻

B．导体和绝缘体的电阻大小只跟材料有关

C．将一根铜导线均匀拉长后，其电阻变大

D．铜导线的电阻一定比铝导线的电阻小

答案

答案：C

补全对话，情景问答

补全对话。

Mother---M Jack—J

M: Jack! Are the football socks on ______ (1) bed?

J: Oh, yes.

M: Put ______ (2) away. You must look ______ (3) your things.

J: I'm ______ (4), but…

M: What's wrong?

J: My football socks ______ (5) broken. Can you ______ (6) them, Mum?

M: I think ______ (7). Give them ______ (8) me.

J: ______ (9) you are. Thank you very much.

M: You're ____ (10).

问答题简答题

简述建立原型模型对软件需求分析的作用。