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问题 单项选择题

组合开关有多对触头与轴固定联接，可随手柄的转动使动触头与静触头接通或分断。可用作（）开关，也可用于控制机床上的小功率异步电动机。

A.电源的引入

B.封闭式负荷

C.频繁接通和分断带有负荷的主电路

D.大容量的控制电路

答案

参考答案：A

阅读理解

读短文，回答问题。    

     Peter went to the library yesterday. He got up early and went to the library after breakfast.

Usually Peter goes to the library by bus and that day he had a new idea.  He went by his new bike.

     In the library he saw some new science books and he really wanted to read

them all but he couldn't. He could only have three books at a time.

     He took the books and walked out of the library. He went to his bike but

he couldn't open it with his key. What was wrong? He looked at the key and

then looked at the bike. Oh, no. It wasn't his. His bike was next to it on the right!

1. How does Peter usually go to the library?

                                                                        

2. How did Peter go to the library that day?

                                                                        

3. What did Peter see in the library?  

                                                                          

4. Why he couldn't open the bike?

                                                                         
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问答题 简答题

简述原有的认知结构对迁移的作用。
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