When he said this, even Jiao Bai blushed himself, which is like you holding a red brick, walking into a gold store, and saying to the clerk, "Miss, can I use this red brick in exchange for your gold brick?" It takes a lot of courage to say such shameless words.

What made Jiao Bai even more uncomfortable was that the stall owner girl not only happily agreed to the exchange, but also thanked Jiao Bai for his generosity. This made Jiao Bai's conscience hurt a little, so Jiao Bai selected a lot of beautifully made jewelry in this stall, and did not stop until he swept more than half of the stall owner's goods. Most of these jewelry are the products of recent decades, and have little historical value, but fortunately, most of the materials are gold and silver, various colored gemstones, jade agate, etc., and the production is very exquisite, and they are brought back to the earth, whether they are sold or given away, they are all taken.

After buying the jewelry, the nearby stalls have been browsed, and the passage has come to an end. Jiao Bai and the two passed through the middle of the two stalls and came to another passage. The stalls on both sides of the booth have been replaced with everything from nanobots to treat diseases to electric trucks that transport goods.

After Jiao Bai came to this passage, there were a dazzling array of high-tech products on both sides, his eyes lit up when he saw it, his saliva almost flowed down, and he shouted in his heart, "This time is the right place, it's definitely worth the trip, I want to buy and buy next."

Jiao Bai thought so and did so, and for the next hour, he waved the rice and bought it from inside the passage to near the entrance. During this period, all the goods on the stall were bought by Jiao Bai.

Among the many goods, the highest price is a large 3D projector, which costs half a ton of charred grain for just one instrument. However, Jiao Bai didn't feel distressed at all, but felt that it was worth it, the reason is that this kind of large-scale 3D projector has the same effect as the one Jiao Bai has seen in the Jinshan base, after the full power is turned on, it can create a giant projection covering a radius of several kilometers, not only can it deceive the satellites that are high above, but even the planes and mutant beasts flying in the air can also be perfectly deceived.

As early as a few years ago, when the Sheshan stronghold was established, Jiao Bai wanted to get a large 3D projector to cover the entire Sheshan and increase the concealment and security of the stronghold. It's a pity that this kind of large-scale 3D projector was also a strictly controlled equipment of the state before the end of the world, and the number of production was scarce, and most of them were damaged after the end of the world, and the number of surviving was even less. Jiao Bai was able to find one in the free trading market in Houling Town, which can only be said to be his luck enough. And this equipment is not intact, maybe it is damaged in transportation, or it is not well preserved, and the projection lens on this 3D projector has been corroded to a certain extent, resulting in blurred imaging. It was this Rose Legion that didn't buy it directly, allowing this device to flow into the trading market. It is also for this reason that Jiao Bai was able to replace this 3D projector with only half a ton of grain.

If it is before the end of the world, such a small problem as lens corrosion is not a problem at all, just place an order to buy a new lens and replace it, or find a large grinder, remove the lens, re-grind and calibrate, you can easily solve the problem. But after the end of the world, this is a fatal flaw, now that the industrial base of various places is almost destroyed, the factories that can customize large lenses have long been lost in the hands of zombies, and re-grinding will not work, even if you find a well-preserved grinding machine, it will not solve the problem of power supply and operation engineers.

Now that this large 3D projector has fallen into Jiao Bai's hands, the situation is completely different. Jiao Bai has the whole earth behind him and has a very complete industrial system, so it shouldn't be too difficult to make a similar lens. Even if with the mechanical level of the earth, such a large and perfect lens cannot be produced, Jiao Bai can also use the "repair" skill he has just mastered to directly consume energy value and repair the equipment.

Among these purchased goods, there are two other devices that Jiao Bai attaches the most importance to, that is, two large quantum computers. Quantum computer, Jiao Bai got one when he cleared the Sheshan Institute of Electronics, but that quantum computer was an ordinary model used by the state for small research. The two quantum computers are different in that they are not only much larger, but also have several orders of magnitude higher computing power. According to the stall owner who sold the two quantum computers, he and several partners took great risks to move the two pieces of equipment back from the Leizhou National Library. Before the end of the world, the two quantum computers were used as network servers for researchers and students across the country to consult papers and patent documents.

Jiao Bai didn't know if what the stall owner said was true or false, and there was no sufficient power supply here in the trading market, so he couldn't turn on the quantum computer to check the contents stored inside. However, the asking price of these two quantum computers, the stall owner's asking price is only 100 catties of grain, such a cheap price, even if there are no technical documents in it, only these two devices are also worth it. If it is really as the stall owner said, there are a large number of scientific papers and patent materials stored in it, then its value is incalculable, and it is not an exaggeration to say that it is invaluable.

Although scientific papers and patent materials are not ready-made technical materials, they must be reserved in terms of specific implementation details and production steps. But with these materials, Jiaobai's Xingchen Research Institute has a detailed technical roadmap and specific research and development directions. It has been said that "science and technology are advancing through continuous thinking and continuous trial and error." "Once you have these materials, the process of thinking and trial and error is all eliminated, and whatever you want to develop is straight to the point, and the technology tree is not climbing fast.

There is also a large category of scientific and technological papers, called basic scientific and technological papers, such as the formulation and proof of mathematical conjectures, the exploration and demonstration of theoretical physics, the conjecture and experimental discovery of elementary particles, and so on. These things seem to have nothing to do with people's daily life, but behind the scenes, they are driving the continuous evolution and progress of science and technology, and the appearance of society. However, in China, due to historical legacies and insufficient attention, the investment in basic scientific research has always been low, and the results are very limited. With these basic scientific and technological papers, Jiao Bai can slowly release some world-leading papers in the name of the Xingchen Research Institute to promote the accelerated development of Huaxia Science and Technology.

When he was approaching the exit of the market, Jiao Bai saw a lot of people surrounded by a stall in front of him, three circles inside and three circles outside, which completely blocked Jiao Bai's sight, and couldn't help but ask curiously:

"Hey, why are there so many people in front? Is there something good? ”