Zhang Keke replied while flipping through a book, "The exam time is the same for the whole school, from the 18th to the 25th, but the exam room and seating are determined by your class."

Wang Yan reacted and asked hurriedly, "Ling Yue, from what you said, you haven't attended class yet, have you?"

Ling Yue was speechless. She said during the day that if they knew, she would probably get beaten, but she couldn't hide it at night.

She nodded helplessly: "Well, I had something to do some time ago, so I haven't been to school."

Wang Yan sat up excitedly and said angrily, "No way, no way, you are too good. We are tortured by the teacher every day, but you can hide and sleep soundly."

Why can't this person understand what she's saying? Is she saying something is wrong?

Zhang Keke glanced at Wang Yan, threw the book onto the pillow with a thud, and then smashed it down. She pulled the quilt up to cover her head and grumbled, "Envy, jealousy! Humph."

The girl sleeping in the lower bunk of Zhang Keke, with two pigtails and a red flower-patterned cotton jacket, pursed her lips and said, "You can't say that. How can we take the exam if we don't attend classes? Besides, the knowledge is ours. It's better to learn it than not to learn it at all."

Zhang Keke was stunned and quickly interrupted, "Oh, I haven't introduced her to you yet. This is Zhang Lan, our roommate's studious classmate. She went to the library this afternoon, so you didn't see her."

"Hello!" Ling Yue greeted.

Zhang Lan nodded without raising his head.

Ling Yue's eyes flashed, then she lay down on the bed and fell asleep in a second.

She doesn't take these things to heart. She comes back to rest when she has time. If she doesn't have time, she won't even see him, let alone escalate the conflict.

However, what happened today reminded her that not everyone is like Qian Zilin, Xiangzhong, Sister Wu and others.

The next morning, Ling Yue was woken up by her roommate.

She opened her eyes drowsily and looked at Zhang Lan who was slamming the toiletries into the box, then she got up weakly.

It’s better not to sleep yet. Let’s take a nap when we get back to the lab.

If there was no place to take a shower in the laboratory and it was difficult to take care of personal hygiene, and she had to run to the dormitory area to take a shower, she really wanted to settle down in the laboratory.

After she had packed up, everyone was ready to leave.

Ling Yue was not from the same college as them, so she was not with them.

There were students walking in a hurry all along the way, but Ling Yue's stroll seemed more unique.

When Ling Yue finally found her class, she discovered that the class was already in session. She bent over and quietly entered through the back door and sat in the last row. It was too cold outside, so it was warmer in the classroom.

This class is a professional mathematics course, and what is being taught is differentials in calculus.

Imperial University of Peking does not leave class time for students to review. At most, it gives half a class period to highlight the key points, which may be the key points of the entire book.

Calculus is not difficult. It is actually just dividing the area under the curve into countless rectangles, and then finding the area of ​​the rectangles.

However, as we all know, a plane is made up of an infinite number of points, and the number of rectangles drawn is also infinite. As N increases, this approximation becomes more accurate, hence the emergence of infinitesimals. (Sooner or later, derivatives will appear.)

When the bell rang, the students gathered around the teacher to solve problems, and Ling Yue finally found her name on the bulletin board next to the blackboard.

Because it is easy to find, the last one, it is hanging upright at first glance.

Mathematical Analysis: 11-3-314, 25th, January 18th morning.

Advanced Algebra: 11-4-412, 25th, January 18th, afternoon.

"Hey, I haven't seen this classmate before. Which department is he from?"

Ling Yue heard the voice and looked in the direction it came from. She saw an old man, who was the teacher of this class, wearing reading glasses and looking at her through the top of his glasses.

His eyes looked unfriendly and very alert.

"From the Department of Mathematics." Ling Yue said softly.

Okay, as soon as Ling Yue finished speaking, the old man's eyes became more unfriendly and more vigilant.

He asked why there was only one girl in the class, and suddenly there was one more.

The advantage of Du Miao Miao is that you can tell at a glance who has attended the class and who has not.

What's more, Ling Yue has regular facial features, and because she has not seen the sun for many years, her skin is extremely white. Standing in the crowd, she is like a tree trunk, an existence that cannot be ignored.

"You're so young, and I haven't seen you for a semester. What's going on?" the old man asked with a stern face. He has been teaching all his life, and he hates students who skip classes without reason the most.

Ling Yue smiled awkwardly upon hearing this and said, "Sorry, teacher, I just transferred here. Something happened at home, so I didn't have time to report in."

At this point, the old man retracted his displeased gaze and said, "Well, study hard when you come back."

Ling Yue nodded and sighed helplessly in her heart. It would be better not to have a holiday at all. There are so many troubles.

But the old man would be disappointed. After all, she just came to see his examination room, and he didn't know when they would meet again.

After looking at the examination room, Ling Yue turned around and left without taking away a speck of dust.

It just so happened that the next class was the old man’s class. After looking around but not seeing Ling Yue, he simply drew a cross on his notebook.

Ling Yue had no idea that she had been blacklisted by the old man. At this moment, she was sitting in her laboratory writing a project plan for an artificial satellite.

This thing is too big and it costs a lot to build one. It's not like a computer that you can just tinker with and make.

If this country burdened with foreign debt wants to produce, it will probably have to mobilize the entire country. Therefore, the more detailed the plan, the easier it will be to approve, and of course, it will be more convenient for others to learn from it.

Satellite classification is very complicated. Based on their uses alone, they can be divided into more than ten types, including communication satellites, meteorological satellites, reconnaissance satellites, navigation satellites, etc.

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