In terms of non-metallic superconducting technology, there are problems in production cost and equipment.

    Therefore, Wang Bin prefers metal room temperature superconducting materials, especially those with common metal materials as the core, such as copper and iron. Magnesium, aluminum, etc.

    In entering the science and technology mall system, Wang Bin directly ignored the non-metallic superconducting material technology, chose the normal temperature metal superconducting technology, and selected it among the sub projects.

    There are also many metal superconducting material technologies, such as iron-based superconducting material technology, magnesium based superconducting material, copper based superconducting material, thallium based superconducting material, mercury based superconducting material and so on.

    However, Wang Bin directly ignores those superconducting technologies with rare materials or metals as the main materials, because even if Wang Bin buys these technologies, they are still some chicken ribs for his world.

    Coupled with the use of scarce metal materials as the main materials, the production cost will be very high and the materials will be very difficult to obtain. Even if the basic materials can be purchased from the system in the future, the price must not be cheap and very uneconomical, so these Wang Bin basically do not consider.

    Soon he found the technology of iron-based and copper-based superconducting materials.

    Of course, even for iron-based or copper-based superconducting material technology, the materials used are not only metals such as iron and copper, but also many other materials. However, compared with the previous superconducting materials based on scarce materials, these superconducting materials are only used in a small amount.

    However, compared with those superconducting material technologies based on scarce materials, superconducting material technologies based on common metals are obviously much higher in price.

    For example, the primary superconducting material technology with metal niobium as the main material sells for only 30000 energy coins in the mall.

    However, the price of primary copper-based superconducting material technology with copper as the main material in the mall is as high as 45000 energy coins, while that of iron-based materials is more than 50000.

    Then Wang Bin thought about it and directly purchased copper based room temperature superconducting material technology based on copper from the mall at the price of 45000 energy coins.

    As for iron-based room temperature superconducting material technology, these energy coins in Wang Bin''s hand can not be purchased.

    Just when Wang Bin bought the copper based superconducting material technology, Wang Bin''s system rang again; "Dear host, congratulations. You have completed all the requirements for the promotion of the science and technology mall. Would you like to promote the science and technology mall?"

    After listening to the words of the system, Wang Bin''s heart was finally greatly relieved. In fact, the reason why Wang Bin was so eager to buy technology is actually for the promotion of the system.

    After all, at the first level, Wang Bin can only buy primary material technology in the system.

    As for other technologies. He can only deceive the technology he wants from his customers, and even if he deceives the technology, he must realize these technologies by himself, and can''t put the technology directly into his mind.

    However, after reaching the second level, the technology Wang Bin can buy in the system is not just material technology.

    At the second level, Wang Bin can not only continue to buy materials and technologies in the system, but also buy various raw materials that can be found in nature. Most importantly, at the second level, Wang Bin can use the system to buy some real scientific and technological products.

    So he immediately opened the system and inquired about what he could buy. He found that the price of these raw materials in the system was almost the same as that in reality.

    However, it is extremely uneconomical to use energy coins to buy some common materials that are easy to buy in reality, such as steel.

    However, if you use energy coins to buy those scarce materials in the mall, it will be different. The first is the scarce materials, although there are very few in the real world.

    But it is different in other cosmic civilizations. Maybe there are such materials everywhere in a world.

    Therefore, no matter what materials are in the mall, even in the real world, the whole earth is extremely rare raw materials, which are not limited in supply in the mall, but the price is a little high.

    At the secondary level, the system has much lower restrictions on the products sold in the technology mall.

    The products previously sold in the technology mall must be 100% of the products produced by Wang Bin and Tiangong technology.

    At the same time, in terms of technology, only those with factory design or purchased from the mall system can be sold in the system.

    Now, this restriction is much lower. Except for the product technology itself, which must be designed by itself or purchased from the system, the restrictions on product production are not as strict as before.

    A product can be sold in the technology mall as long as it is a core component plus more than 50% of the accessories produced by its own factory.

    So when Wang Bin saw here, he was very happy. After all, it was OK before. It was just basic material technology. Therefore, in addition to raw materials, all processes were completed by himself in the smelting process.

    But it will be different in the future. In the future, the products produced by Tiangong technology are destined to be more and more, the technology will be more and more complex, and there will be more and more internal parts, so they can''t produce all these parts by themselves.

    Most importantly, according to the rules of the system, if an enterprise''s shares are purchased by Wang Bin for more than 50%, the products produced by the enterprise can also be sold in the system as long as the drawings or core technology are provided by Wang Bin.

    In addition, after the level reaches level 2, Wang Bin can buy a lot more technologies, except for the key technologies of civilization upgrading that cannot be purchased from the system.

    For example, controllable nuclear fusion technology, large spacecraft technology that really has the ability to navigate in the planetary system for a long time, anti gravity and artificial gravity technology, etc.

    Because according to the regulations of the system, if Wang Bin wants to buy these technologies.

    Then Wang Bin must raise the level of the system to level 3, and the key index to level 3 is to raise the scientific and technological level of human civilization to above level 0.9.

    In addition, more than ten technologies shall be purchased in the system, and these technologies shall not be basic material technologies, and the price of each technology shall not be less than 100000 energy coins.

    In addition to these, there is another most important indicator, that is, the factory owned by the host must have the ability to manufacture small and medium-sized spacecraft in the planetary system.

    After reading these, Wang Bin knew that he didn''t have to count on it in a short time.

    So he looked at the technologies he can buy now. He found that there are many kinds of technologies in the system, covering all the technology categories of the whole human civilization, from the simplest to the most advanced, which can be basically found.

    At the same time, in terms of price, like the previous material technology, those simple and backward technologies are not worth money in the system.

    Take ordinary paper production technology for example. The price in the system is only one energy currency.

    However, if it is the world''s top paper production technology, the price will be as high as thousands or even tens of thousands of energy coins.

    Of course, if it is the paper manufacturing technology that exceeds the current level of human civilization, the price will be higher, at least in terms of universal currency.