Last year, some groups of students in their community (社区) made a survey about "How do people spend their free time?" The following diagrams show some results of it:
Diagram (1): Hours for people of different ages who surf the Internet in a week.

Diagram (2): Different days people go to the library. (library attendance)

Diagram (3): Different programs people like.

根据上面三个图表内容，选择正确答案。

如图是直流电铃的原理图，关于电铃工作时的说法不正确的是

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