小汉很喜欢看侦探小说,他的理想是长大后当一名警察。他从很多影视剧中看到,警察在案件发生后到达现场,通常会从现场的物品上寻找犯罪分子的指纹信息,以此来锁定犯罪分子。这使他产生了好奇,我们平时在接触到的东西上看不到自己的指纹,警察是怎样“看到”的呢?通过查找资料,他进行了下面的实验:(1)找一张没有使用过的白纸,在白纸上轻轻按下几个指印, Xiao Han likes to watch detective novels, his ideal is to grow up as a police officer. He saw in many television dramas that the police arrived at the scene after the incident and usually searched criminals by finding fingerprints of criminals from the articles on the scene. This gave him curiosity, we usually do not see their fingerprints on the exposed things, the police is how to “see”? By looking for information, he conducted the following experiment: (1) to find a Zhang did not use the white paper, gently press a few fingerprints on the white paper,