In comparison, the difficulty is almost zero.

Because even if you just get a few potatoes or something, you can make biopower generation, as long as the wattage of the light bulb is not too high......!

In other words, after finding copper wires and tungsten wires, and getting wires and light bulbs, you can easily complete the task of the city that never sleeps, and then turn Chang'an into a city that never sleeps!

Even if you can't make a low-power bulb, there's nothing wrong with it, after all, if the biopower generation technology can't work, you can still use a Tesla hand-cranked generator, and it's not difficult to make that thing, at least Lin Zifan knows.

Yes, although Lin Zifan was complaining about the system, he didn't have much dissatisfaction in his heart.

......

In the early morning of the erection day, Lin Zifan did not directly set off to the deep mountains to look for tungsten wire, iron wire or something, but first went to the school.

The trip to the West Wilderness has made the students grow a lot, especially after the 'final assessment' and all the students moved stones, the students are all much more honest.

After all, only by experiencing it can you be more aware of your own shortcomings!

In the final assessment, both male and female students knew that their strength was still far behind! Especially male students, knowing their own strength, could hardly help them.

In this case, they took a little blow, but it was not a big blow!

It's easy to understand, but in short, it's stimulated. Knowing that he is a 'weak man', he will inevitably not be able to count on force or anything, so if he wants to improve himself, he can only do it from the aspect of knowledge as much as possible.

Knowledge happens to be the most indispensable existence in the academy! Naturally, they study harder.

The girls are not much worse, although their force has more or less played a role, but the problem is that the person who gets the perfect evaluation is a boy!

And most importantly, in the end, the problem is solved, and the person who thinks of driving all the 'bad guys' away with a fire is also the boy!

Especially the descendants of the nine important ministers, after they come back, they are even more assiduous!

Lin Zifan was naturally very happy to see this kind of scene.

Early in the morning, as soon as Lin Zifan arrived at the school, many students had already arrived, and it was not like the original, playing on the side, and even a few girls would get together to punch each other, and they would slap each other in the face......

Today, they all sit obediently in their places and read books seriously.

Where did the book come from?

Naturally, it is a condensed version of the textbook written by Lin Zifan based on his primary and secondary school knowledge.

To put it simply, it is the common words of the language, as well as some calculations necessary for mathematics, plus several books such as physics and chemistry.

The most detailed and complex of these are undoubtedly physics and chemistry.

After all, as long as you can read Chinese, there is no problem, there is no need to learn foreign languages, and you don't need to learn advanced mathematics calculus or anything like mathematics, so there is no need for anything.

But physics and chemistry are very important, only by learning these two subjects well, after graduation, can they become Lin Zifan's good helpers, or can they really do their part for Datang.

"These naughty and mischievous guys, suddenly so serious today, it makes me a little unaccustomed......"

Lin Zifan chuckled and shook his head, and stepped into the teacher.

"Morning master!"

One by one, the students' eyes widened, and they all got up and saluted Lin Zifan, he smiled when he saw this, and motioned for everyone to sit down.

"In the next period of time, the main part of the house will leave Chang'an, and the date of return is unknown, so there is no need to go to class......"

“......”

The students blinked, silent, but everyone could tell that their little faces were full of disbelief.

"Even though there are no classes, you still need to come to the school every day. ”

Lin Zifan's next sentence made the surprise on the faces of the students freeze instantly, and the look of disbelief quickly disappeared.

Look, I know that this black-hearted maggot is not well-intentioned!

The students rolled their eyes, mostly at the same thought......

"As for why you don't have to go to school, there is a reason. Lin Zifan grinned: "I thought of an excellent homework for you, during the time I was not in Chang'an, you need to all work together to complete the homework, otherwise it will ......"

The corners of Lin Zifan's mouth furled: "When I come back, you will know what cruelty is!"

Students: "......"

Okay!

This goods will leave Chang'an for a period of time, and if it is no longer in Chang'an, it will leave us with problems......

The students muttered in their hearts, very entangled.

"Look!"

Lin Zifan smiled, scribbled on the blackboard, and it took a few minutes before he finally stopped the chalk in his hand, turned to look at the students, and said, "You didn't know this thing before, but now, you know it!"

"I've talked to you about it before, and there is relevant knowledge in the book, but I haven't talked about it in detail, but now, I need you to work together to solve it!"

"The principle is very simple! It is to use high temperature to boil water to produce a large amount ......of steam, and then use the force generated by the steam to drive the flywheel through gears and pistons, etc.

"But that's all I can tell you now!"

"How to make a steam engine and do it well is a problem you need to consider!"

The smile on Lin Zifan's face was even brighter, as if he had thought of something extremely happy, but it made the students' hearts furious, and even many of them were timid.

"Remember to do your best, or ......"

Lin Zifan said with a smile: "When I come back, you ...... Don't even think about running. Such as...... Ninety-nine multiplication table, read it a thousand times to understand?"

“！！！”

The students' faces turned green in an instant!

Ninety-nine multiplication table, copy a thousand times?

Although they can now memorize the ninety-nine multiplication table backwards, writing, copying books and so on, is still a kind of 'torture' for them, right?

"Craftsmen and materials, I will transfer them from the department, so don't try to prevaricate me with the excuse of lack of materials and craftsmen!"

"You know, right?"

The students looked at each other, speechless.

Do you need to think so well?

They wanted to cry without tears, so they could only nod their heads lightly to show that they understood......

"Oh, yes!"

Lin Zifan's eyes rolled, and a smile resurfaced: "During my absence, out of kindness, I found a substitute teacher for you......"

"Of course, the substitute teacher is not responsible for the class, but only for supervision!"

And then ...... Don't think I'm not here to do whatever I want!"