"Solution: When the wave propagates to point P, the displacement of the point P is zero, and the direction of vibration is ...... downward"

Lin Wei, who was writing the question, heard the vibration of her mobile phone and glanced at the screen.

The pen she held in her right hand did not stop, and she pointed at the keyboard with her left hand, looking at the words without being too distracted.

I'm going to Tsinghua: Well, I've seen it.

I'm going to Tsinghua University: I saw it when you stretched out in the morning.

I want to go to Tsinghua University: Boy, good waist.

After writing a big question, Lin Wei realized that something was not quite right.

It's a mobile phone.

After she replied to Jiangsu's message, her mobile phone was very quiet.

Unlock the screen, and the chat page really doesn't receive any reply messages. Chatting and chatting, there are back and forth before it is called chatting, Jiang Su has no movement, of course Lin Wei cannot continue to sing a one-man show alone. How stupid that is.

As soon as Lin Wei wanted to put away her mobile phone, she saw the message she had sent.

Day.

Lin Wei's first reaction was to withdraw, but it had been more than two minutes since the message was sent, and it was to no avail.

Annoyed and remorseful, she slammed her head on the desk.

She does the questions, and when she does the questions, she chats with people in a good manner.

She chats and chats, and when she chats, why is she molesting people for no reason.

The more Lin Wei thought about it, the more embarrassed she became, and she couldn't help but knock her head twice.

The sound of knocking this time was a little loud, which attracted the attention of many people, and even Bai Jian, who was holding his mobile phone and wholeheartedly raising a boyfriend, turned his head: "Weiwei, what are you doing?" ”

Lin Wei sighed, met the eyes of many classmates, blinked, and immediately pulled out another math book, put it on the physics book that had just been knocked by her head, and continued to knock three times: "Worship the textbook, kneel and beg for a good score in the exam the day after tomorrow." ”

The front table looked skeptical: "Does it work?" ”

Lin Wei slowly took out the chemistry book from the table pocket, and under the gaze of more and more students, she knocked three times unhurriedly: "I don't know if it works, anyway, I can take the first test every time." ”

Lin Wei said, continuing to dig out English books.

Who is Lin Wei? Grade 1.

Since she ascended to the position of the first year of the year in the final exam of the first semester of her freshman year, she has never been taken down from that position.

There is a saying that the ranking of flowing water is the first year of iron.

The students in the first class gradually began to waver, isn't it just a few knocks on their heads, in case it works.

People are knocking every year, what qualifications do they have to continue to be stubborn?

So, the inverted one, oh no, now it's the inverted two, Lin Xiang, took out the math book that had been scribbled by himself so that he couldn't tell what it was, and knocked it three times very reverently.

And then there was a second man, a third man, and a fourth man...... Then, the first class ushered in the first class of the afternoon with a bang.

…

Jiang Su thought about it, how did he think that the five words "boy, good waist" are not quite like compliments.

Like ...... Dalliance.

What's even more nonsense is that he has been chased by various girls since junior high school to confess with notes, and he was actually molested...... I'm sorry.

Jiang Su pinched his slightly burned earlobe, cleared his voice, and held his mobile phone expressionlessly, responding to the message from an hour ago.

…

Lin Wei was between classes after the first class, and after returning from the toilet with Bai Jian, she saw Jiang Su's WeChat.

SU: Discerning.

Lin Wei slowly typed a question mark on the door of her head.

Fortunately, she was used to Jiang Su's abbreviation function, and she slowed down for a few seconds to understand what he meant.

Dare to love him, this is to praise her for her vision.

The reason why she praised her was because she thought he had a good waist.

Lin Wei muttered: "Narcissism." ”

Lin Wei didn't actually want to return to Jiangsu news, but she thought about it, a well-behaved and sensible three-good student like herself who was worry-free, inexplicably paying attention to a teenager's waist, seemed a little inappropriate.

Although she thinks it's okay to pay attention to her waist or even doubt her personality orientation, after all, today's high school students are not as innocent and ignorant as everyone thinks, but she still feels that it is necessary to make herself as stupid as possible.

Lin Wei thought about it for a while and decided to explain it to Jiang Su.

I want to go to Tsinghua University: I didn't mean to see it.

I want to go to Tsinghua University: The main reason is that your skin is too white, and the line of your waist is very good, which makes people notice it all of a sudden.

There was no movement on the Jiang side.

It wasn't until the end of class that Lin Wei's mobile phone vibrate.

SU: I remember quite clearly.

Lin Wei: ???

Three seconds later, Lin Wei looked at the "white skin and good lines" posted on the screen and opened her mouth.

Yes, the more you depict it, the darker it gets.

…

After replying to the message, Jiang Su raised his hand a little uncomfortably and rubbed the tip of his nose.

After a moment, he touched his neck a little uncomfortably.

Oh my God.

He was actually praised by the little next door...... Shy.