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复印机,大家都用过吧?它能奇妙地复制出一模一样的文件。但你知道复印机是怎么工作的吗?一天,我在一份报纸上看到了一篇相关的文章,兴趣盎然,很想知道其中的奥秘,便照着文章内容做起实验来。我先找来一团棉花,蘸了一些痱子粉,放在电视机旁。接着,打开电视机,十几分钟后关掉。这时,我迅速用手指在屏幕上写下我的姓——“曾”字,并画上一个圈。我快速拿起蘸有痱子粉的棉花团,在屏幕前轻轻拍打起来。这时,奇妙的现象发生了——飞扬的痱子粉纷纷被吸附在电视屏幕上,但是手指划过的地方却几乎没有粉末,屏幕上显示出了一个“曾”的图案。这是怎么回事呢?我在网上查阅了有关资料才明白:原来,打开又关掉
Copiers, we have used it? It can be wonderful to copy the same file. But did you know how the copier worked? One day I saw an article in a newspaper full of interest and I really wanted to know the mystery and started the experiment according to the content of the article. I first find a group of cotton, dipped in some prickly heat powder, on the TV next. Then, turn on the TV, turn off after ten minutes. At this moment, I quickly wrote my last name - “Zeng ” on the screen with my finger and drew a circle. I quickly picked up the cotton boll dipped in razor clam and patted it gently in front of the screen. At this moment, the fantastic phenomenon happened - the flying prickly heat was adsorbed on the TV screen one by one, but the place where the finger was stroked was almost no powder, and the screen showed a pattern of “Zeng”. What’s going on? I read the information online to understand: the original, turn on and off