Huang Yuhang said with great certainty: "There is no doubt that my wish must be to fill in the chemistry major. ”

Lan Jie kindly reminded: "I heard that chemistry is a pit." ”

Huang Yuhang looked like he was at home: "Even if it is a fire pit, I will jump into it without hesitation! Chemistry is my faith, and I have no regrets if I dedicate myself to my faith!"

In this realistic and impetuous society, the only people who have a little bit of faith are probably primary and secondary school students. Lan Jie said sincerely: "Yuhang, I am touched by your determination and faith. ”

"Brother Jie, to be honest, I got better grades in chemistry, and if I studied a non-chemistry major in college, I was afraid that I would be miserable if I failed the subject. ”

"Poof, Yuhang, you're finally telling the truth!"

"But chemistry is really my faith, and that's true. ”

"Astronaut, do you have a university of your choice?"

"Of course I want to go to Yanda or Mizuki's chemical institute, but my level is limited and I can't go. To be realistic, if I can be admitted to the chemical institute of Yang University, then I will wake up laughing when I fall asleep. Continue to be realistic, there is a high probability that Yangdahua Institute is a dream, and for me, it is very satisfying to be able to pass a line. I'm not qualified to pick and choose, the only thing I can do is try to get a higher score. ”

"Come on, Yuhang, I wish you to go to the next level, if you have any questions you don't understand in your studies, you can always find me. Of course, I am not as good as the teacher, but I may be more down-to-earth when I answer your questions with the thinking of a student. ”

Huang Yuhang was really moved, he said: "I am a borrowed student in the sheep, my school registration is in the sweet potato area, many people look down on me, I go to ask them questions, they are polite on the surface, but they don't treat me as a person at all in their hearts." Only Brother Jie, you really care about me, help me, communicate with me with an equal mentality, and treat me as a human being. I don't have good grades, but I'm not stupid, I can feel Brother Jie, you are different from theirs, Brother Jie, thank you!"

Huang Yuhang's simple and sincere language moved Lan Jie, he said: "They are all classmates, and it is appropriate to help each other." ”

"Brother Jie, I still want to be in a group with you for the afternoon biological experiment, is it okay?"

"Yes, our experiments are getting more and more tacit. ”

There are a lot of lab classes today, chemistry experiments in the morning and biology experiments in the afternoon.

Before doing biological experiments, Mr. Wang Liangcheng briefly talked about the background of the experiment: "RNA, DNA, DNA, are polynucleotides formed by many single nucleotides linked by phosphate bonds. In nucleic acids, organic bases, pentose sugar, and phosphoric acid exist almost as many molecules, and the general method for determining nucleic acids is to determine any one of the three components. Today we are doing ultraviolet absorption to determine the nucleic acid content, not much to say, start work!"

The determination of nucleic acid is an important experiment, and teachers and students attach great importance to this experiment. Lan Jie and Huang Yuhang were in a group, and each of them took a small test tube, numbered A and B.

The two carefully titrated 0.5ml of sample solution and 0.5ml of distilled water into tube A, and titrated 0.5ml of sample solution and 0.5ml of ammonium molybdate-perchloric acid into tube B. Then mix well, place in a water bath for 30min, and centrifuge at 3000r/min for 10min.

Lan Jie remembered that in a physics experiment class this semester, Huang Yuhang was beaten up by Tang Xiaoyun because of his ridiculous and clumsy experimental operation. Even Huang Yuhang himself admitted that he was deeply handicapped and pulled down the average of the class.

Shi Bei was impressed by the three days, the chemical experiment in the morning, and the current biological experiment, Huang Yuhang did it according to the experimental requirements, and his experimental operation was not extremely perfect, but it was absolutely qualified.

"Yuhang, you're a fast learner, and you've made significant progress in experiments. Lan Jie gave his experimental partner a pertinent evaluation.

Huang Yuhang said in a deep voice: "If a person is helpless, he will learn everything." ”

Lan Jie suddenly felt distressed: "This is philosophical, and it is also a little sad." ”

The experimental principle of measuring nucleic acid is not difficult, and the operation requires the experimenter to be careful and steady, and the details of the micro-operation must be done well, and no sloppiness is allowed.

Most of the biological dogs do manual work, and the bosses don't need the dogs to play spiritually, so it's OK to do the manual labor for me honestly and carefully.

Huang Yuhang felt it: "Brother Jie, the real pit is not chemistry, but biology. ”

"You're still too modest, your degree has gone up, your knowledge has gone up, and your understanding of life has reached a new height. I think your recent progress is visible to the naked eye, and your goal is definitely not the most ordinary kind of university. ”

"Brother Jie, this may be Zhu Zhechi. ”

The experiment continued, Lan Jie and Huang Yuhang complemented each other, they respectively sucked 0.4ml of supernatant from two test tubes into two 50ml volumetric flasks, fixed the volume to the scale, distilled water as a blank zero point, and measured the absorbance at 260nm on the ultraviolet spectrophotometer.

According to the experimental results, Huang Yuhang calculated the RNA concentration and the percentage of nucleic acid content of the solid sample, which Lan Jie approved and submitted the experimental record paper to Mr. Wang Liangcheng.

Wang Liangcheng expressed satisfaction: "OK, no problem, you two can leave after packing up the experimental table." ”

Huang Yuhang took the initiative to clean up the experimental table, and Lan Jie stayed by Wang Liangcheng's side and asked: "Teacher Wang, the summer vacation is coming soon, do we have any activities in the Star Club in the summer?"

Wang Liangcheng nodded and said, "Yes." ”

"There's an event, isn't it, that's great!" Ranger was very happy, and he asked expectantly, "Where are we going to go stargazing in the summer?"

Wang Liangcheng replied: "Provincial Astronomical Museum." ”

Lan Jie was extremely shocked: "Ah, go there? As we all know, the astronomical telescope of the Provincial Astronomical Museum is fake! I'm sorry, let me correct it, the telescope in their museum is real, but it is in a state where it can only be viewed from a distance and cannot be practiced. ”

Wang Liangcheng said calmly: "There are exhibitions in the exhibition halls on the first and second floors of the museum, and we can go to see the exhibitions." ”

Lan Jie is not calm: "There is no charge for tickets to their museum, and you can enter the museum with your ID card and student ID, but if you go to the exhibition hall to see the exhibition, you don't need to come forward to coordinate and organize, and our students can go to see the exhibition by themselves." ”

"Can an individual acting alone be of the same nature as an organized group activity?"

"To tell you the truth, I'm definitely willing to participate in group activities, Mr. Wang, can't we go to the stars outdoors in our group activities? I mean, wouldn't it be fun to go to a place like Twin Island, set up a telescope, and look at the stars at night?"

Teacher Wang smiled bitterly: "Hehe, I was bitten by the grade director again, and it is impossible to organize to watch the stars outdoors." ”

Lan Jie was upset with Mr. Wang: "Mr. Wang, you teach biology well and are helpful in life, and you are deeply loved by students and have won the trust of parents. I don't understand, you are such an excellent teacher, why does the head of the grade hold you every day?"