Super Weapon Swap System

What Qin Guan was most afraid to see was Lisa. After entering the system several times, he didn't see anyone else and was almost always haunted by Lisa.

What about this time? Will Lisa come up from the back and rub herself with that full meat ball? I can't stand it.

Qin Guan thought in his heart and looked around.

Here, as before, is a vast land, there is no boundless grassland, only a gurgling stream. At this time, by the stream, Hou Zhu and Zhou Hou are playing the piano there, and the melodious sound of musical instruments echoes in the space.

What about grassland heroes?

The grassland hero's Trojan horse broke down and a horse leg fell off. At this time, the grassland hero was repairing the Trojan horse there. While repairing it, he also said: "don't let you cross the river and find the mare over there. You just don't listen. It's autumn now. What's your feeling?"

This is the world in the spirit of Qin Guan, a place that has not been developed. Everything here is in the spirit. You can get what you want. Qin Guan must have been suffocated after looking at the grassland heroes for so long.

"Wow." suddenly, the whole Trojan horse fell apart.

"Damn it." the grassland hero's face was full of anger: "you still don't want to follow me, do you? In that case, I don't want you. I'll find a tank to play with and I'll kill you with armor piercing bullets."

It seems that the tank test during the day has shocked the grassland hero. He is already interested in tanks.

Where's Lisa? Where's Lisa?

Qin Guan was very curious. Did you finish reciting the Tao Te Ching long ago?

"Dear, I haven't seen you for so long. Do you miss me?" a voice came from behind.

Qin Guan turned his head curiously and saw Lisa with two sweater needles in her hands. She was knitting a sweater?

"It's going to autumn. I'm afraid you'll be cold, so I'll learn to knit a sweater. Have a look, how's my knitting?" said Lisa, taking out the sweater in her hand.

The color is bright red. In later generations, both men and women like it, but in this era, few men wear red, right?

Qin Guan looked at the sweater in Lisa's hand and said, "well, it looks good, but only one doesn't work."

"Honey, what else do you want?"

"One blue, one white, one black, one sweater, one knitted hat, one glove, and one woolen pants. Well, woolen pants are the same color as the sweater." Qin Guan said, "by the way, don't knit green hats."

If a person is bored, what can he do? You might as well try knitting a sweater.

Knitting is definitely a good opportunity for leisure. Now Qin Guan is very happy to find that Lisa likes knitting sweaters. Yes, you can knit a lot of sweaters so that you won't bother me. By the way, there are some requirements for patterns. In short, play by yourself.

"No problem, dear." Lisa was beside Qin Guan, weaving a sweater as if there were no one else. At the same time, Qin Guan was finally relieved.

"System, come out."

"Master, what can I do for you?"

Master? When did you become so humble? What novel are you reading recently? It's all right. Don't look at those who love and fight in the palace. Look at how good the war is.

"In the currency cemetery, I want to exchange gold. What should I exchange?" Qin Guan asked.

"Of course, it's gold. Wait for a pledge exchange." the system said: "master, if there's nothing wrong, I'll study my maid cos outfit."

"Wait!" Qin Guan finally understood that this damn system is playing cos recently. It's silent in his imaginary world. Is it interesting?

"If you want to exchange gold for gold, what use do I want you to have?" Qin Guan was angry at the system.

"Oh, master, I may not have made it clear." the system said: "it's not necessarily gold. Gold mine can also be. As long as there is gold in it, the system can automatically enrich when exchanging. If you like, you can go for gold at any time and flash."

There is very little pure gold in nature. Due to the crustal movement and geological changes of hundreds of millions to billions of years, gold elements are enriched into gold deposits. It often contains associated elements such as silver, copper, iron, palladium, bismuth, platinum, nickel, tellurium, selenium and osmium. Natural gold containing more than 15% silver is called silver gold, more than 20% copper is called copper gold, 5-11% palladium is called palladium gold, and more than 4% bismuth is called bismuth gold.

In other words, the grade of gold in gold mines of general industrial value is 2-3 g / T, rich ore is 5-50 g / T, super rich ore is 50-500 g / T, and lump gold. The smallest piece is more than ten grams, the largest is dozens of kilograms, and the rare lump gold is hundreds of kilograms. Because some of them look like dog's head, they are commonly known as dog's head gold. If they can find this thing, they will definitely make a lot of money.

Generally, they are lean ores, which are 0.1-1 g / T. generally speaking, more than 0.5 g / T has industrial mining value.

There must be many gold mines in China now. When Qin Guan goes there, he can't give full play to his value, that is, he can only shorten the time. Therefore, if Qin Guan wants to go, he can only go to the poor mines that have no mining value and exchange the gold.

Such as quality exchange, gold ore exchange for gold, in this case, you can also try.

However, 0.1g can be extracted from a ton of ore. It needs to exchange a few tons of gold. It must be a mountain?

Qin Guan thought of this and still felt a little broken down. At this time, Lisa, on the other side, opened her mouth.

"It doesn't have to be element correspondence for mass exchange." Lisa, a woman from the Renaissance, is also very familiar with modern science: "for example, the atomic number of gold is 79. We can find copper and tin. The atomic numbers are 29 and 50 respectively. Together, they can make up 79."

What is matter? Matter is composed of atomic nucleus and electrons outside the nucleus. The type of matter depends on the atomic number, and the world is opposite to its original world, but the basic principle is the same.

One can't be replaced by two. It's definitely not difficult to find hundreds of tons of copper and tin.

"Is it OK?" Qin Guan looked at Lisa with joy and even couldn't help shaking each other with his hands. Is it OK? Really?

"No problem, of course, but you have to give me permission," Lisa said.

Last time, because Lisa sent a bra out, Qin Guan was greatly surprised. After that, Qin Guan asked the system to block the loophole. There must be no more accidents. Otherwise, what should Lisa do if she sent herself out?

Now, this is a big deal. If Lisa solves this problem, in the future, the system of equal quality exchange can be flexible!