After returning to the guest house after work, after a simple working meal in the restaurant, Geng Zhiyuan arrived in the room exhausted. He was accustomed to walking after dinner, and although he was a little tired, he still put down his backpack, walked out of the guest house empty-handed, and walked slowly down the street.

It was just after six o'clock, and it was getting dark. The town is not big, with only three or four main streets, and the streets are lined with low and dilapidated houses, and there are hardly any decent shops in sight. There are no street lights on either side of the road, and there are only a handful of pedestrians on the dimly lit streets, and there are discarded plastic bags and other garbage under their feet from time to time.

Geng Zhiyuan walked east along the road for a while, and a school suddenly appeared in front of him, with a mottled sign hanging on the red brick gate: Hometown Town Middle School.

Geng Zhiyuan grew up in the city and saw a township middle school for the first time in his life. Curiously, he looked through the gate into the school, and all he saw was an old bungalow with red bricks and gray tiles, and there was no shadow of a half-cent building.

Geng Zhiyuan looked bored, turned around and was about to walk back, but caught a glimpse of a familiar figure walking towards him.

"How could it be her!? I'm dazzled, right?" Geng Zhiyuan blinked, fixed his eyes and took a closer look, it was really her!

The beautiful figure came towards him in a daze. Seeing him, Geng Zhiyuan plucked up his courage and shouted worriedly: "Wei Xiao!"

The girl raised her head in surprise, her pretty face was moving, she was really Wei Xiao with a stunning face.

"Geng Zhiyuan!?" Wei Xiao's eyes widened and he looked at him incredulously.

"Why are you here?" the two men shouted in unison.

In a remote town with few acquaintances, I met the goddess I coveted in the past, and I don't know if this is a coincidence or a joke played by fate.

Geng Zhiyuan said with a smile: "The fertilizer plant has a project from our design institute, and I came here to provide construction services. Why are you here?"

Wei Xiao said with a gloomy expression: "I was assigned to this school after graduation and has been teaching here. ”

"Really?" Geng Zhiyuan looked at Wei Xiao, who was emaciated, and said with some distress: "It's too remote here, why don't you want to find a way to transfer to a school in the city?"

Wei Xiao raised his hand and combed the hair on his sideburns, and said with a bitter smile: "How can it be so easy?" I want to, too, but I have been teaching here for two years, and I haven't found a way yet." ”

The goddess who had been thinking about it for a long time was actually teaching and educating people in such a remote and desolate place, and Geng Zhiyuan felt sad for no reason: "You live in the school?"

"Well, there are bachelor dormitories in the school. Wei Xiao secretly glanced at Geng Zhiyuan, a few days ago, she was laughed at by the toad who wanted to eat swan meat, but now she is really standing by her side, and the girl can't help but feel the tricks of fate and the impermanence of life.

Since I met Wei Xiao once during the Spring Festival of my sophomore year of high school, the two old classmates have never had a chance to meet again in the past five years, until they met by chance on the street a few days ago. What Wei Xiao has experienced in the past five years, Geng Zhiyuan has no idea.

He really wanted to find a quiet place to have a good chat with his goddess, and ask her how she had come over the past few years, but he was too embarrassed to open his mouth anyway. And Wei Xiao didn't know what to say for a while, and the two of them were embarrassed for a while, looking at each other silently.

"...... you and Wang Chenguang?" Geng Zhiyuan couldn't help but ask first.

Wei Xiao's face turned red and said, "I haven't been in contact with him for a long time." ”

Wang Chenguang is the junior high school classmate of the two, and he is also Wei Xiao's tablemate. In his sophomore year of high school, Geng Zhiyuan found Wei Xiao's family through Wang Chenguang. After this incident, Wang Chenguang cut off contact with him, and Geng Zhiyuan, who was emotionally dull, later figured out that Wang Chenguang and Wei Xiao were a pair of lovers. He wanted to rob Wang Chenguang's girlfriend for no reason, he was naturally annoyed and angry, and broke off Geng Zhiyuan.

"So you ...... now Are you married?" Geng Zhiyuan really wanted to know what kind of outstanding man he had chosen for the flawless goddess in his mind, so he asked cheekily.

Wei Xiao glanced up at him a little shyly, lowered his head and said sadly: "I work in this kind of place, it's not even easy to find a partner, why do you get married?"

Geng Zhiyuan had mixed feelings for a while. Originally, he thought that after the last chance meeting, the two of them would say goodbye and stop bothering for the rest of their lives. Unexpectedly, God favored him, so that he saw the coveted goddess Wei Xiao again.

It's a pity that now he is just a recent graduate, his ability is very limited, and he can't help Wei Xiao's current difficult situation, so he can only watch his goddess sad.

"I ...... You ......" Geng Zhiyuan snorted, wanting to say a few words of comfort. In the blur of night, Wei Xiao's slender and elegant figure was quite charming and sultry, and he suddenly became nervous under the excitement, his brain was blank, and he couldn't even say a complete word.

"I ...... I'll go back, goodbye. Wei Xiao suddenly remembered the indifference and alienation of Geng Zhiyuan before, and now that they met in a foreign land, even if the girl wanted to talk more to her old classmates, it was difficult to open her mouth. After thinking about it, she threw out a sentence without a head, and then lowered her head and hurriedly ran into the school gate.

"Hey......" Geng Zhiyuan raised his hand to call her to stop, but stopped halfway through. Although the two of them are old classmates, they have been separated for so many years, and they already have a slight strangeness to each other. And Wei Xiao has always had a lukewarm attitude towards herself, and it is wishful thinking to want to reminisce about her past life with her.

Geng Zhiyuan shook his head self-deprecatingly, and looked straight at Wei Xiao's beautiful figure and disappeared into the red brick room. He stood in a daze for a few moments, and then reluctantly walked back.

After returning to the guest house and taking a comfortable hot shower, Geng Zhiyuan took out the "Nitric Acid Design Manual" and studied carefully by the light. The unexpected encounter with the goddess made him a little impetuous, and he didn't learn much after watching it for more than half an hour. He reluctantly closed the book and paced onto the balcony to look east.

"She's right under my nose, it's at my fingertips, should I seize the opportunity to chase her cheekily again?" Geng Zhiyuan looked at the lights on the dark campus from afar, his heart beating.

A voice sounded in my head: "Don't be embarrassed, she is too prejudiced against you, and it is impossible to have the slightest affection for you." Pursuing her again can only be a senseless embarrassment. ”

Another voice sounded: "Between the world and the world, if the white horse passes through the gap, it will be all of a sudden." Since God has given this opportunity, what's the point of giving it a try? Even if you fail, you will not have any regrets in your life, and you don't have to wait until a hundred years later to regret it. ”

Two voices rang out in turn, mingling in their heads.

After thinking about it for a long time, Geng Zhiyuan sighed and said, "Let's go! She is a teacher here, and I am in the provincial design institute." I don't have the ability to transfer her to the provincial capital, let alone people don't like me at all. Even if I still like her, I can only bury that love in my heart as a memory. Recognize the reality, you are no longer a child, and stop making useless naïve fantasies!"

The decision was made, and Geng Zhiyuan settled down and looked at the book.

The full name of the manual given to him by Lao Zhang is "Nitrogen Fertilizer Process Design Manual Nitric Acid Ammonium Nitrate", which was published by the Chemical Industry Press in 1983. The manual mainly describes in detail the process flow, process calculation, equipment calculation, material selection, key equipment structure and other contents of chemical products such as dilute nitric acid, concentrated nitric acid, nitrate, ammonium nitrate, etc.

This manual is a book of the town industry engaged in nitric acid and ammonium nitrate industry, and it explains the data required for various process design without reservation. In the developed capitalist countries of the West, the above processes and data involve the core technologies of the most important professional companies, and they will not be easily taken out to communicate with peers for free.

The manual is mainly compiled by the first, second and fourth design institutes of the Ministry of Chemical Industry. According to Lao Zhang, the factory originally wanted to hand over the 30,000-ton medium-pressure nitric acid project to the Shandong Provincial Planning and Design Institute for design, because the institute has made many achievements in nitric acid and nitrate design. However, under the coordination of the Provincial Department of Chemical Industry, in line with the principle that fertilizer and water do not flow into outsiders' fields, it was handed over to the Donghai Provincial Chemical Design Institute.

There are too many contents in the manual, and I can't finish reading it in a month or two, so Geng Zhiyuan started with the first chapter of dilute nitric acid.

There are many kinds of dilute nitric acid processes, all of which use ammonia to oxidize with oxygen in the air under the catalysis of platinum mesh to produce nitrogen oxides, and then absorb them with water to become dilute nitric acid products.

According to the different oxidation and absorption pressures, the production of dilute nitric acid is divided into atmospheric pressure method, comprehensive method, medium pressure method, high pressure method, and double pressure method. Among them, the atmospheric pressure method and the comprehensive method have been eliminated due to the high cost and low acid concentration, and the medium pressure method is also on the verge of being eliminated due to the limited scale. The most advanced modern process is the double pressurization method.

Each process manual is accompanied by a flow chart and a material balance diagram, Geng Zhiyuan focused on learning medium pressure nitric acid, compared with the manual, and then contacted the equipment, plant and drawings seen on the spot, he gradually walked into the ocean of technical composition.

Geng Zhiyuan was fascinated, and before he knew it, it was late at night. He yawned, closed the book and sighed: "It's enjoyable, it's enjoyable! This book looks really interesting, if it is placed in the martial arts world, it is comparable to "Jiuyang Divine Skill". ”

It was a brain-wrenching reading of technical books, so he turned off the light and fell into bed, and it didn't take long for him to fall asleep. In his sleep, he vaguely returned to his youthful junior high school days.

"Geng Zhiyuan!" Mr. Du, the head teacher on the podium, suddenly called his name, Geng Zhiyuan quickly stood up and said, "Mr. Du, you call me?"

"You went and changed seats with Wang Chenguang. "Teacher Du's order is really strange, how does he know that Geng Zhiyuan has been looking forward to sitting with Wei Xiao?

Geng Zhiyuan came to Wei Xiao's side with his schoolbag nervously, and hesitated, "Can I sit down?"

Wei Xiao turned his head and smiled at him: "You sit down, I knew you would come to me." I've been waiting for you for a long time......"

Wei Xiao had been waiting for him, Geng Zhiyuan was overjoyed, pressed his beating heart, and finally sat down carefully next to the goddess......

"Ah......!?" In the dark, Geng Zhiyuan suddenly woke up, he sat up and patted his forehead and said in frustration: "Alas! It turned out to be Nan Ke's dream! No wonder, when I was in junior high school, I wasn't interested in Wei Xiao, how could I think of being in the same position as her? The so-called day and night dream, probably this is the case for me. ”

"Sleep, how can the goddess like me? Don't think about it!" he persuaded himself, and he forced himself to lie down, and finally fell asleep again.