After the cabin door opened, the tall and fat President of the United States, Aiden Victor, walked down the ladder that had been turned over on the inside of the cabin door.

Behind him, there are several fully armed soldiers holding M85 multi-functional automatic rifles (strategic rifles that integrate ***, ***, intelligent gliding grenade launcher, laser rangefinder and other functions), but although their military uniforms are also one-piece digital camouflage uniforms with dark green colors, the cut style is different from the US military combat uniforms, and it is not clear which country's army they belong to.

After Aiden and the soldiers approached the cabin, José touched a few small CDs in his arms with his left hand, lowered his head and raised his right hand to cover his eyes, while Steyr simply sat on the ground and sighed.

Because they saw that two of the soldiers behind Aiden were obviously escorting the American president at gunpoint.

Behind a half-collapsed villa on the seaside of Dalian, China, and the rest of it looks crumbling, there is a courtyard the size of a basketball court, in which a large blue square tent with the words "emergency disaster" printed in white Chinese is set up, and Zhang Qian and her father, Zhang Da, sit on two small white plastic stools next to a small yellow wooden table in the tent, tinkering with various equipment.

Zhang's mother used an aluminum pot to cook fillet porridge by the stone stove outside the tent, and the fish that Zhang Qian and Zhang Da had just returned from their trip to the beach to fish.

Before entering the state of emergency, Zhang Qian and her parents bought and hoarded rice, which was enough to eat for a long time.

In the vicinity of the community where the Zhang family lives, the government has set up a distribution point for daily necessities, and each person can receive a bucket of water, three or two meters or noodles, one or two pieces of meat, some vegetables and charcoal every day.

However, Zhang Da believes that he still has surplus grain and some canned meat, and has opened up a few vegetable plots in the two large courtyards in front of and behind the villa early, raising more than a dozen chickens, and does not need to receive food distributed by the government for the time being, so that he can give food to other families who need it more. Therefore, apart from water and charcoal, the Zhang family did not begin to receive other supplies.

When Zhang Da was tinkering with the carbon fiber frame electric car in his yard, he found that the NdFeB strong magnetic magnet used in the motor was corroded because of the iron in it, and the whole magnet collapsed into powder, but it could still absorb part of the powder of the steel parts on the side, so he came up with the idea of repairing the radio and making a simple generator.

The battery used in this Wuling Hongguang i electric car is a graphene capacitor battery, which can travel more than 3,000 kilometers on a single charge, and the charging time is only five seconds.

At night these days, Zhang's family can use the lights on the sedan to illuminate, because the battery pack and wiring and the lights do not contain steel materials.

Zhang's mother originally wanted to use an induction cooker and an aluminum pot that did not contain steel parts to cook rice, but the aluminum pot could not be used on the induction cooker, so she had to give up. Most of the other heating appliances have been scrapped because they contain steel.

Taking advantage of the inattention of his daughter and wife, Zhang Da ventured into the basement of the dilapidated house and took out a Desheng rechargeable radio produced in 2000 from the wooden shelf where he stored antiques.

There are not many iron parts in the radio, but it is not too little, Zhang Da tried his best to use aluminum alloy to slowly polish on the whetstone to make a replacement for the original iron parts.

The most critical horn magnet was handed over to Zhang Qian, who first used mud to pinch a mold that was about the same shape as the original magnet.

Then the residual magnet powder in the electric vehicle strengthens the glue and condenses it into a small piece of "magnet" in the mold.

After the various substitutes were ready, Zhang Da reassembled the radio, put the power plug into the power socket in the car, pressed the radio power button, and it rang.

Before the "end of the world", although the traditional radio stations were completely networked, and the old-fashioned radios could no longer receive the as many official broadcasts as they did a hundred or two hundred years ago, there were still many radio enthusiasts who preferred to send their own broadcasts, so the old-fashioned radios could still receive some strange personal voices, such as singing, storytelling, poetry readings, or swearing.

Zhang Da tuned the channel for a while, but did not receive the messy things before, but several channels were broadcasting a voice: "Please rest assured that the government will set up emergency resettlement points for everyone as much as possible, and distribute the corresponding materials free of charge, I hope everyone will abide by the law, obey the arrangements and commands of the nearest government and military and police personnel, and work and live with peace of mind." Without the various difficulties caused by steel, our researchers are solving them one by one, and have obtained many breakthrough research results! Hope will be ours, victory will be ours! ”

After the passage was repeated a dozen times, the radio channels began to broadcast all kinds of current affairs news in a unified manner.

Zhang Da said while listening to the news: "I'll just say, the government will definitely have a way, even the two of us liberal arts students can restore the radio function, and the government has so many scientific and technological personnel, it will definitely be able to solve all kinds of problems caused by the lack of steel." ”

Zhang Qian said: "This is indeed the case, but what I am worried about now is that the enemy's so-called rebellion will start today, and I don't know the news about this..."

Zhang Da nodded and said: "Indeed, I don't know where the so-called rebellion started, I hope it doesn't happen in my country, I'll turn down the channel and see if I can receive other news." ”

However, after Zhang Da changed the channel for a few more rounds, there was still no other channel except for the news broadcast by the government.

The next step is to make a generator in case the car battery runs out and loses power.

Generators are usually composed of stator, rotor, end cap and bearing.

The stator consists of a stator core, a wire-wrapped winding, a base, and other structural parts that hold these parts in place.

The rotor is composed of rotor core (or magnetic pole, magnetic choke) winding, retaining ring, central ring, slip ring, fan and rotating shaft.

The stator and rotor of the generator are connected and assembled by the bearing and the end cover, so that the rotor can rotate in the stator and do the movement of cutting magnetic field lines, so as to generate an induced electric potential, which is drawn out through the terminal and connected to the circuit, and the current is generated.

Of course, under extreme conditions, some of the minor components mentioned above can be omitted.

After the father and daughter discussed the general plan, Zhang Qian first dug a small hole in the lid and bottom of the complete 600ml empty plastic bottle of Coca-Cola.

A plastic coat rack is broken open to obtain a long, thin plastic stick that fits into the bottle from top to bottom and sticks out 10 centimeters at each end.

The bottle was filled with powder from the corroded magnets of electric vehicles and other machinery that she had collected from everywhere, and the lid was screwed on, and a plastic stick was placed on the bottom and lid, and the gaps were sealed and glued with super glue.