Retracing the Police Path 1993

Liu Pengcheng actually had nothing to do when he returned to Ruicheng for the New Year this time. Since he got a mobile phone, the difficulty of communication has been greatly reduced. He can talk on the phone about anything. When he goes home, he mainly wants to see his family.

In two days, Liu Pengcheng visited most of his relatives and had dinner with his friends in the evening.

On the third day, Liu Pengcheng took his wife and children directly to Xidu to see his father-in-law's family. He planned to stay in Xidu for three days before returning to Ruicheng.

Xiaogu's previous phone calls were not about breakthrough progress, but mainly about Liu Pengcheng's journey.As a driver, he was of course worried about Liu Pengcheng's driving safety. However, after talking about daily life, Xiaogu reported a new matter to Liu Pengcheng.

It's haunted again.

This time was different from the past. No physical ghost appeared and no substantial damage was caused.

Fatty Feng is kind to workers, and he is somewhat famous in the industry for this.Fatty Feng has two rules. First, take care of the food!Take care of breakfast and lunch, but not dinner!Second, each worker is given an egg in the morning and noon, two eggs a day!

The problem lies with this egg. When we were eating in the morning, a worker saw some crooked symbols on the egg. He asked someone who knew how to read it. After looking carefully, he found that the Chinese character "鬼" was written on it.

When I found it, the eggs had already been peeled and all kinds of debris were thrown on the floor, so the writing was not very clear.I checked later and found that at least six eggs had this word on them. They were not exactly the same, but they were all the same word.

The words are not written with a pen, but appear as if they were reflected on the egg itself. The word "鬼" covers about half of the egg, and the font part appears a little brighter than the other parts. Other than that, everything is the same.

The workers had never seen this before, and they were so frightened that no one dared to eat the eggs and threw them away immediately.When Xiao Gu found out about this and found the eggs, there were still two eggs with words on them that no one dared to eat.

The workers were afraid, but Xiaogu was certainly not afraid. He contacted Liu Pengcheng immediately. Liu Pengcheng knew that it was a chemical problem, so he asked Xiaogu to go to Professor Xu with the egg skins.

There was no need to study this kind of pediatrics in front of Professor Xu, so he directly gave the answer - vinegar.

Simply put, use scissors to cut a thin plastic tape, like paper cutting, cut out horizontal and vertical strokes, and then stick it on the egg to form a word.

After pasting, put the eggs in a bowl of vinegar, take them out after 10 minutes, peel off the tape, and then two distinct colors will be formed.This kind of color difference is not caused by painting with a paintbrush, so it cannot be washed off or damaged by cooking.

Professor Xu even demonstrated it to Xiao Gu in person, cutting out a word "神". Although Professor Xu's paper-cutting skills were average, the experiment was still very successful.

Taking this "magic" egg, Xiaogu returned to the construction site again and showed it to Fatty Feng.Fatty Feng felt like he had found a treasure. He knew that it was unrealistic to teach chemistry to the workers, so he said that he had invited gods, so there was no need to be afraid of ghosts!

This "god" egg was placed at the entrance of the construction site, so the workers were naturally not afraid.

The construction progress of the air-raid shelter is still going very smoothly. On the third day after the "ghost" egg incident, all the cleaning and lighting installation work was completed.In other words, there is currently no debris in the entire air raid shelter, and the lights are bright!In this way, ghosts are nothing to be afraid of.According to current estimates, it will be completed before the Chinese New Year!
Chinese New Year!

For workers, after completing this order, they can get money to go home for the New Year, which is wonderful!
Liu Pengcheng had always paid attention to Yuhang, but he was never in a hurry to go back. He also told Xiaogu that he didn't need to pay too much attention to this matter and rested when he needed to.

It wasn't until the third day after he returned to Ruicheng from Xidu that Liu Pengcheng received Xiaogu's call again. "Is there any new progress?" Liu Pengcheng was still a little curious. He knew that the project was progressing smoothly, could it still be haunted now?

"Brother Liu, I've been searching for so many days, and finally I found something different!" Xiao Gu's voice had a hint of excitement.

"Is it convenient for you to talk over there?" Liu Pengcheng reminded.

"Conveniently, I'm at school!"

"Back to school?" Liu Pengcheng was a little confused.

"Yeah! I'm with Professor Xu and Professor Luo."

"Professor Luo is here too?" Liu Pengcheng was a little confused. It was normal for Professor Xu to be the tutor, but it was abnormal for Professor Luo to be there. After all, he was on vacation.

"Well, I'm here too," Professor Luo answered the phone, "Recently, there was a case in Yuhang, which happened to involve the Fourth Hospital. I was invited to do the appraisal, and that's when I met Professor Xu, and when I came across Xiaogu's case, I Let’s chat.”

"Wait a minute," Liu Pengcheng was a little surprised, "Is there a murder case in the fourth hospital? If so, I should know!"

"It's not a homicide, it's a medical accident. The family of the deceased thought the hospital's treatment process was unreasonable and complained to the Health Bureau. The case is now under the supervision of the Ministry of Health. Yuhang has invited some experts, including me." Professor Luo explained.

"So this is an old case?"

"Well, it's been two months."

"Then why are you involved in today's case?" Liu Pengcheng asked again.

"Let me tell you," Xiao Gu said, "Director Liu, this is what happened. I also told you what happened a few days ago. Since the egg made by Professor Xu was laid out, the follow-up project has gone very smoothly. Although I didn't find out who placed those eggs, no one made any trouble. As of today, the electricity in the air-raid shelter has been installed. However, when I dug the water pipe trench today, I was cautious and dug out all the water pipes. After checking everything, I found a problem. The stones dug out in several places were obviously more humid. I took samples and asked Professor Xu to take a look. He said that these stones were severely corroded. Like natural corrosion.”

"You mean, how many houses have the entire floor corroded?"

"Yes, including the house where we found the bottle of 'celestial liquid'."

"What does Professor Xu mean?" Liu Pengcheng asked.

"I went to those houses today to conduct on-site inspections. Although they were cleaned very well, I still found traces of corrosion on the ground. It was very slight. I collected some samples and found the gypsum component, which covered the marble surface with a layer of corrosion. , very thin, I speculate that sulfuric acid has been sprinkled here." Professor Xu explained.

We all learned in middle school that the reaction between hydrochloric acid and marble (the main component is calcium carbonate) can produce calcium chloride and carbon dioxide. This is also how carbon dioxide is prepared in the laboratory.The reaction between sulfuric acid and marble is relatively difficult, because the generated calcium sulfate (the main component of gypsum) is insoluble in water and will form a protective layer on the marble surface. (End of chapter)