"However, you still have to pay a 1 yuan photocopying fee.”
"What?! You still have to pay a 1 yuan photocopying fee?" I took the paper and looked at it. What a joke! It was too wasteful to only print the front and not the back. I'd rather not have such a ghastly appearance! To read so much at once was simply too much! I don't even know how to prevent myself from falling asleep. I'm a chemistry student, but I'm not only getting sleepy, I'm also hating this subject as much as I hate math.
Amidst the sound of books being read, the chemistry teacher came in. He was wearing a blue and white striped short-sleeved shirt and a pair of black trousers. He didn't look like much. He turned on the projector as soon as he entered the classroom. Suddenly, the screen slowly descended from above. The switch under the projector turned from red to green, and the green light was flashing. Not long after, a picture appeared on the screen, and the green light began to stop.
Since the four of us just entered the school not long ago, we don't even have a single book, let alone a review outline. The four of us had to listen to them finish. As for the briefcase, it was just for show. There was nothing inside.
(Everyone: Rewind!) Sweat b||| |~~~）
After about 15 minutes, the teacher shouted," Class!”，The class monitor shouted,"Stand up!" We said,"Hello, teacher!" Finally, the teacher told us to sit down. These few steps were too troublesome. He had no choice. This was a form of respect for his teacher. He had to stand even if he did not want to.
"Alright, today we will open a new unit, Metals and Metal Materials.”He pointed at the black words on the screen with a yellow wooden ruler,"Unit 8 Metals and Metallic Materials". His voice was Very loud and clear, and his words were very powerful and imposing. Since there were no books, he could only look at the screen and learn. Speaking of which, we haven't learned this unit before. Alright, since it's a new lesson, let's listen.
"We have three topics for this unit: The first topic was metal materials. The chemical properties of metals. The utilization and protection of metal resources.
What was metal? Metal was shiny but not transparent. It was malleable, heat-conducting, and tough.。。。。。The common metals were iron, aluminum, copper, and copper. The metals used in the gold industry were divided into black metals and non-colored metals. There were three types of black metals, namely, iron, Chromiumand Manganese. Non-Ferrous Metal: All metals except black metals. According to the density classification, they could be divided into light metals and heavy metals. The density of light metal is less than 4.5g/cm3, such as: K (potassium-based), Ca-based (calcium), Na-based (sodium-based), M-based (magnesium-based), Al-based (aluminum), etc. The density of heavy metals was greater than 4.5 g/cm. For example, Mn (Mn), Mn (Mn). There were also metals, pure metals, and alloys.
Of course, the use of materials had to consider the nature of the material, as well as the price and beauty, the convenience of use, the resources, the recycling of waste, the impact on the environment, and so on.”At this point, he used something that looked like a recording pen to press on the screen. Immediately, a table appeared on the screen. What was that?
"That's a remote control that can remotely control the computer and projector. You just need to press it to change the image in the slide to the next slide, just like a TV ~~" The little boy told me. He didn't expect Earth to have such a thing.
The form looked like this:
------------------
Physical properties: Comparatively good electrical conductivity (silver is 100), silver copper gold, aluminum, iron, lead
**77.9
density (g/cm-3) Gold, lead, silver, copper, iron, aluminum
19.311.310.58.927.867.142.70
Melting point (° C): tungsten, iron, copper, gold, silver, aluminum, tin
****2
Hardness (Diamond = 10) Chromium-iron Silver Copper Gold Aluminium-lead
94～52.5～32.5～32.5～32～2.91.5
--------------------
"Let's take a look." The chemistry teacher pointed at the screen and turned to the right. Wow! The chemistry teacher must be an expert dancer!
"It's too strong!" Standing Wind Ocean and Feixue Yuhong were also shocked, but their brother was a little speechless.
"He does that sometimes.”Chen Ji said to us.
"This is a comparison of the physical properties of some metals. First, let's look at the electrical conductivity:
The standard here was the electrical conductivity of silver. Silver has a electrical conductivity of 100, followed by Copper: 99, once again it was gold: 74. AI (aluminum): 27, iron (iron) 17, and finally lead (lead): 7.9。From this, it could be seen that their electrical conductivity went from excellent to good. The better the metal, the stronger the electrical conductivity.
And look at density--density is in g/cm-3
First, it was the gold: 11.3、Cu：10.5。。。。。。The last was AI: 2.70. Their density decreased from large to small.
And then the melting point--the melting point is measured in degrees Celsius
First was tungsten. The highest melting point of tungsten was 3410 ° C. Therefore, the wire was made of tungsten. The second was iron: 1083。。。。。。。The last one was 232. The melting point went from high to low.
Finally, he looked at the density. The hardness of diamond was used as the standard. The main component of diamond was C (carbon). In descending order, they were Cr9, Fe3, Fe 4~~5, silver: 2.5~4, and the melting point of copper and gold is the same, followed by aluminum: 2~2.9, the smallest is Pb: 1.5。”
Wow! If we had to memorize it, I wouldn't have spent so much effort on memorizing it. I really don't know how many brain cells I'll have to waste. My brother doesn't seem to be interested in this at all. He even wants to sleep after listening to it. Li Feng Zeyang doesn't seem to want to spend too much time listening to the lecture, but Fei Xue Yuhong is listening to the lecture very seriously. They were simply people from two different worlds.
"Because I didn't understand it when I was in the third year of junior high school, I can listen to it now and treat it as tuition. Actually, the third year of junior high was pretty good. However, he did not have any brush, ink, paper, and inkstone, so he could only use his brain to remember. Aiyo, let's not talk about it anymore. I still have to attend class.”Hence, he became serious again.
Heh, what's with the 'brush, ink, paper, and inkstone'?! What kind of time is it now? Don't tell me you still want to take the imperial examination! Hao Hao wasn't born during the Sui Dynasty on Earth. I don't want to memorize a bunch of classical Chinese like the Four Books and Five Classics,"The Analects of Confucius", which are even more difficult to understand than "English"(Everyone: Hey, hey, do you have to memorize the Four Books and Five Classics for the Jinshi examination? Why not? Speaking of which, I don't know if I want it or not.。。=__=||| |~~~~）! Therefore, I basically didn't listen to classical Chinese in Chinese class. I would occasionally listen to texts and the like, which is why Chinese is like a stock market now."All the cherry blossoms on the tree have fallen, leaving only the green leaves." When I saw it, even Leaf would die together with Scraping Wood! o()o Alas ~~ I had no choice but to repeatedly say to myself in class (during Chinese class): Knowing is knowing, not knowing is not knowing, it is knowing ~~~ In short, just turn a blind eye and pretend that nothing has happened. Or close your eyes to rest…。Z~~
Z~~
─.─Z~~
(Everyone: From this, I can see that what you said is even more difficult to understand than classical Chinese.)。。。。。）
─__─||| ||b~~不懂拉倒! Ah! Damn it! He was distracted again! (Teacher) What did he just say! --
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