Escape From the Library

【Deep Starry Sky-19】

Jiang Pingce used the coordinate system to take everyone around the planet at the fastest speed. His skills would cool down every half an hour. It was not until 6 pm that day that everyone returned to the original landing position.Jiang Pingce quickly calculated the data: "According to our speed and time calculation, the distance around the planet is 800 kilometers."

Qin Lu said: "I remember that it takes more than 4 kilometers to go around the earth, and the circle of this planet is only 800 kilometers. In other words, the earth is 50 times that?"

Only one-fiftieth of the earth's volume sounds small, but the problem is that about 70% of the earth's surface is covered by oceans, and the land accounts for less than 30%, and this planet has no oceans. The entire circle, the surface of the entire planet is covered with scorched black soil and covered with endless mountains.

Therefore, the area they need to search is not small.

The next moment, Jiang Pingce said the precise result: "The circumference is 800 kilometers, the diameter is 254.77 kilometers, and the surface area of ​​the sphere is 20 square kilometers."

Qin Lu thought about it carefully, and said, "It's almost the combined area of ​​Jiangsu and Zhejiang provinces?"

Everyone had no idea about the specific data, but when Qin Lu gave an example, the data immediately became intuitive.Liu Zhaoqing pressed his temples with a headache, and said, "There are only 18 days left. It's a bit difficult to search a huge area equivalent to the area of ​​two provinces in a blanket search!"

Xu Yishen said with a smile: "It's actually not difficult. We have Qin Lu, who changes positions 12 times a day, that's 6 kilometers, and it only takes 30 seconds. In Pincer's coordinate system, it takes half an hour to fly in the air at high speed. And Xingwen's speed is fast, and the whole group speeds up by 5 times. Our 183 action team is equivalent to traveling on a high-speed train!"

Ke Shaobin asked: "Can we fly the aircraft to search?"

Zhuo Feng shook his head: "Probably not, I need to use a magnet to collect ores, but the aircraft is likely to crash due to the influence of the magnetic field."

Yue Xingwen looked back at his younger brother and said, "Xiao Nian, you build a building here to hide the aircraft. Then we divide the entire planet into four areas according to Pince's surface division method, and search one by one."

Everyone immediately divided up the work and cooperated. Zhang Xiaonian was in charge of building the base, and Jiang Pingce took everyone's location as the origin and drew four straight rays in four directions, extending into the distance.

It wasn't until 8 o'clock in the evening that everyone was busy.

Jiang Pingce said: "Qin Lu, use your skills first, and search the first area."

Qin Lu took out the globe and led everyone forward to change positions quickly.

Along the way, Zhuo Feng used magnets to collect the surrounding ores, and the ore collection rate in the suspension frame was also increasing. After Qin Lu ran out of 12 plate transpositions, the collection rate also became 15/100.

With so many stones, it will be very heavy to carry on your back.Lin Manluo wove a basket out of vines, put all the collected ore into it, and carried it away with Qin Miao.The two girls looked tired carrying a lot of stones. In fact, Zhuo Feng used his skills to reduce their weight. The two girls felt no pressure at all, just like lifting a ball of feathers.

After some rectification, Jiang Pingce used the coordinate formula to lead everyone forward.Zhuo Feng used magnets to search for targets along the way, and when the mountain range was completely searched, the collection rate became 20/100.

Ke Shaobin looked at the ore in the basket, and said: "We are going well today. In just one day, we have collected 20 mission targets. There are still 18 days, more than enough!"

Xin Yan said: "Don't be too happy. The goal of the mission requires us to 'collect all' 100 pieces of ore, that is to say, even if we collect 99 pieces, we are still short of the last piece. If we don't collect all of them, we won't be given 1 points, but 99 points."

Xin Yan's words hit the nail on the head.

No matter how smooth the early collection progress is, the progress is stuck at 99% in the end, and all previous efforts may be wasted for a single stone.Therefore, collecting 20 yuan on the first day is not something to be happy about.

Ke Shaobin looked at him helplessly: "Xin Yan, don't you really like pouring cold water on it?"

Xin Yan didn't refute, and said calmly: "I'm just stating the facts. We can't relax until all 100 mission targets are collected."

Ke Shaobin shrugged: "Well, you are right. However, Brother Zhuo immediately thought of using magnets to help, which saved a lot of effort. The first day went smoothly, which is also a good sign!"

Yue Xingwen glanced at the two people who were bickering, and said with a smile: "The more you search in the early stage, the less pressure you will have in the future. We try to increase the collection rate to more than 80% in the first few days, and then check the gaps and fill in the gaps. It's already 11 o'clock in the evening, let's rest first, and continue tomorrow."

There is no difference between day and night on the barren planet, but everyone was really tired after a long day of work. Zhang Xiaonian built the base on the spot, and everyone stayed together all night, and continued the search at 8:[-] the next morning.

With Jiang Pingce formulating the path and direction, there is no need to worry about missing or repeating. He calculates the scope of each search very accurately. After another day, the collection rate of ore has reached 40%.

On the 13th day, the task collection rate is 55%;

On the 14th day, the task collection rate is 70%;

On the 15th day, the task collection rate is 80%...

The boring and repetitive collection tasks for several days in a row made everyone exhausted.

Set off at 8 o'clock every morning, collect nickel ore with a magnet on the scorched black mountains that look indistinguishable, open your backpack and eat some compressed biscuits or canned food when you are hungry...

Repetitive tasks are the easiest to get bored.

By the 16th day, everyone's spirits were a little numb, and the repeated movements gave everyone the illusion that they were programmed "robots".

On the night of the 16th day, the collection level rose to 85.

Everyone was sitting exhausted and eating at the temporary base built by Zhang Xiaonian. Ke Shaobin complained while eating: "As expected, the collection speed is getting slower and slower. At the beginning, 20 yuan was credited every day; on the third and fourth days, it was 15 yuan. , 10 yuan on the fifth day, and today on the sixth day, only 5 yuan were found."

20、20、15、15、10、5，他们搜集到的矿石确实在逐步递减。

Yue Xingwen thought for a while and said, "We still have 13 days, don't worry."

But the progress of the next task made everyone anxious——

On the 17th day, they searched an area of ​​nearly 8 square kilometers from 11:2 am to [-]:[-] pm, but failed to find even a single mission target!

Looking at the stagnant task progress of the floating frame, Yue Xingwen said helplessly: "Maybe there is no ore in this area, let's look for it tomorrow."

On the 18th day, the same ending as the previous day - still nothing.

The prompt in the floating box always stays at: 85/100 ore collected, no change.

Seeing Yue Xingwen frowned slightly, Jiang Pingce patted his left hand lightly: "Don't worry, the division I set up has only searched three parts so far, and there is an entire area of ​​nearly 5 square kilometers. We have never been there."

Yue Xingwen nodded: "Well, the rest should be in the fourth area, let's talk about it after searching."

He believes that the area set by Jiang Pingce will not be wrong. They have not missed an inch of land. Since 85% of the three areas have been searched, the remaining 15% is likely to be in the fourth area. There is no time. .

The next day, Jiang Pingce led everyone to continue searching the last area. To the students' delight, on this day, everyone harvested 10 pieces of ore one after another, and the collection rate finally reached 95%.

The anxiety of not finding anything for two consecutive days was swept away, and everyone thought—the rest of the stones must be in this area.

But then, the library slapped them in the face again.

Next, another three consecutive days of zero harvest!

At this time, they had searched all areas of the entire planet like a blanket. Zhang Xiaonian and Ke Shaobin even used a laser mapper to draw an accurate topographic map of the mountains on a laptop.

Ke Shaobin wondered: "Why are there only 95? The remaining 5 must have been missed somewhere!"

Everyone looked at each other.

Yue Xingwen took a deep breath and said as calmly as possible: "We searched the four areas and spent a total of 12 days. There are still 7 days left. It will definitely be too late to search again from the beginning."

The most fearful thing is this kind of result.

They thought they had carefully searched all the areas on the planet, but in the end they were missing a few. It must be too late to search from the beginning, and they don't know where they were missed.

As long as the mission objectives are not collected, they will not be able to pass this class!

What's the use of avoiding cosmic wormholes, dodging cosmic sandstorms, and even making an emergency landing in an escape pod, and surviving the pursuit of alien monsters? !

The final task could not be achieved, and everyone still had to fail collectively.

At this moment, a trace of frustration rose from the bottom of everyone's heart.

No one doubted that Jiang Ping's planned areas would be wrong, and everyone believed that in the past 12 days, every corner of the planet had been searched, and no repeated paths had been taken, and no areas had been missed.What's more, Zhuo Feng's enlarged version of the magnet can attract ore from a super long distance. Even if they miss it with their naked eyes, the magnet will not miss it, right?

What went wrong?

Jiang Pingce frowned, staring at the graphics drawn by Ke Shaobin's computer——

Every area on the planet has a large number of continuous mountains. These mountains have different shapes, trends, and heights. They look extremely messy and irregular.

Jiang Pingce closed his eyes and tried to construct a three-dimensional image.Gradually, a planet appeared in his mind, and countless mountains rose up on the planet, like blood vessels that provide nutrients to the entire planet...

Suddenly, a intersection appeared in front of his eyes.

Jiang Pingce opened his eyes suddenly, looked at the computer screen, and said, "Connect all the plans of these four areas and reconstruct the three-dimensional modeling."

With accurate surveying and mapping data, it is not difficult for Ke Shaobin to use a computer to make a three-dimensional model.He tapped the keyboard with both hands quickly, and soon, a brown three-dimensional planet appeared in front of everyone. The winding mountain ranges on it were like blood vessels surrounding the heart.

Jiang Pingce pointed to several mountain ranges in a row, and said: "Extend these three mountain ranges in reverse, and they will have a common intersection point. The same phenomenon has also appeared in other places, that is to say, assuming that these mountain ranges are not interrupted, they should be from the same mountain range. originating from a location."

Qin Lu's eyes lit up: "I understand! Many mineral veins on this planet have the same root, but some mountains have been razed to the ground during tens of millions of years of wind erosion. From our naked eyes, these mountains are interrupted, but as long as they are reversed and continued, can the real origin be found?"

Jiang Pingce nodded: "Yes. Those points of origin that look like flat ground on the surface, if you dig deeper, you may be able to find more ore hidden underground."