Tang Yue began to select compressed biscuits that met the requirements, and in front of him was almost all the rations in Kunlun Station, these compressed biscuits were ideally enough for him to survive for eight hundred Martian days, which was calculated when the old cat divided the materials - I don't know what the old cat was thinking when he was calculating the food, it held the lives of the last two people in the universe in its hands, and whichever side had one more biscuit, which side would live one more day.

This robot cat played the role of a god, placing Tang Yue and Mai Dong at opposite ends of the scale, weighing the weight of the two lives.

The production date of compressed biscuits in Kunlun station varies, the oldest batch can be traced back to the ninth landing mission, that is ten years ago in 2042, the Orion spacecraft has just been in service for a long time, the Chinese first boarded the spacecraft as the mission commander, it is worth mentioning that the commander is still Tang Yue's teacher, Li Yang, the current deputy director of the China Astronaut Center, is said to be the top flight of the Air Division before being selected as an astronaut.

Tang Yue sat on the edge of the table, with cardboard boxes at his feet, he checked the production date on the biscuit packaging piece by piece, and if he found something that met the requirements, he piled it at hand, and threw it into the box if it didn't meet the requirements.

June 2041...... Wrong. ”

"August 2044, no."

"February 2051, no."

Tang Yue pulled out a piece from the biscuit mountain, "Date of production: July 2046, China Astronaut Scientific Research and Training Center...... That's right! ”

"How much vitamin C can one of these cold-made biscuits contain?"

"I don't know, I can't say for sure." Tang Yue shook his head, he put the compressed biscuit in his hand in front of the camera and shook it, "The packaging says that each biscuit contains one hundred and twenty milligrams of vitamin C, but in fact, it is definitely less than this number, the cold biscuit is a failed product, and the vitamin C contained in it will be continuously lost with the extension of storage time...... It seems to be an average of 25 percent reduction in content every two years. ”

Mai Dong roughly calculated, "So 75% of the vitamin C in the biscuits has deteriorated now?" ”

"Possibly, so these cookies don't have too many vitamins in them, so they can only be used for emergencies." Tang Yue continued to pick, he didn't know how many compressed biscuits that met the requirements in Kunlun Station, as far as the current situation was concerned, the more cold biscuits, the better.

Tang Yue whispered as he read the production day and moon on the package, and threw a large handful of biscuits into the box, beads of sweat on his forehead.

"2051, 2044, 2044...... Or 2044......"

Mai Dong watched Tang Yue's biscuits in his hand on the space station increase one by one, and he was very nervous, this is a matter of life and death, the more biscuits compressed by the cold method, the more vitamin C can be obtained, and the more time left for Tang Yue.

"How are you going to collect the vitamin C from these cookies?" The girl asked, "You can't eat them all, can you?" ”

According to Tang Yue, the cold-made compressed biscuits contain less than 30 milligrams of vitamin C, and an adult should supplement 100 to 120 milligrams of vitamin C a day, and on Mars this number will be even higher, not to mention that Tang Yue's body is on the verge of suffering from scurvy, and he needs to consume at least 200 to 300 milligrams of vitamin C every day.

If Tang Yue relied on eating biscuits to supplement vitamins, then he would have to eat ten cold-processed compressed biscuits a day.

It's sure to eat him to death.

"Of course you can't eat it, you and I are a carbohydrate-burning machine? More than a dozen yuan a day, you should fill the boiler with coal? Tang Yue patted the bricks piled up beside his hand, "So many compressed biscuits, it will definitely kill you to eat, I want to extract the vitamins!" ”

"Extraction?"

"Yes, do you remember the properties of ascorbic acid?" Tang Yue gritted his teeth and smiled, "It happens to be the easiest type of vitamin to extract!" ”

"Ascorbic acid is easily soluble in water...... Are you saying that vitamin C is a water-soluble vitamin? Mai Dong frowned, "You want to extract the vitamin C from the biscuit with water?" However, the aqueous solution of vitamin C is not stable at all and is very easy to oxidize. ”

Mai Dong didn't understand why Tang Yue said that ascorbic acid is the easiest vitamin to extract, in fact, on the contrary, the aqueous solution of vitamin C is easily destroyed by oxidation, this thing is extremely reductive, and it cannot exist stably at all, and to extract vitamin C under laboratory conditions, hydrochloric acid or oxalic acid must be added.

"It's inconvenient to extract vitamin C on the earth because of the presence of air, which quickly oxidizes ascorbic acid, but girl, you use your little brain, where am I?" Tang Yue tapped the camera with his finger, and the right was pointed on the girl's forehead, "I won't extract vitamin C in Kunlun Station, I'll go to the garage...... The most lacking thing there is oxygen, and nothing will react with vitamin C, so there is no problem with extracting vitamin C. ”

Mai Dong clapped his hands and exclaimed.

"You're a scholar from the Chinese Academy of Sciences, why can't you even think of this?" Tang Yue smiled.

The girl pouted, Mai Dong didn't think of this, but her thoughts were messed up from the beginning, her brain was blank, and she couldn't think normally, Tang Yue suddenly said that he was about to die, this sentence really frightened Mai Dong, and he still hasn't eased up.

Tang Yue spent an afternoon picking out all the compressed biscuits with production dates between 2046 and 2048, counting a total of ninety-six pieces, and according to the calculation that one biscuit contained 30 milligrams of vitamin C, the ninety-six pieces contained a total of 2,880 milligrams of vitamin C.

"If I take 200 milligrams of vitamin C a day, these cookies will only be enough for me for 14 days." Tang Yue pondered for a moment, "If I supplement two hundred milligrams of vitamin C every two days, then these cookies can be used for a month. ”

The vitamin C content in cold-pressed biscuits is still too low, and the growth cycle of tomatoes is as long as two months.

There is still a month left.

"That's it, it's a month short, it's a big deal, if I reduce the daily dose of vitamin C, I won't be able to die in a month." Tang Yue shook his head, he took down the empty sink on the shelf, counted six compressed biscuits, threw them into the sink, found a metal rod as a pestle, and threw it into the sink, then tore off a roll of medical gauze from the first aid kit, took half a liter of water with a measuring cylinder, packed it in a cup and tightened it, and threw it all into the sink.

In the end, Tang Yue untied a thermal blanket on his body, rolled it up and stuffed it into the sink, and hugged the Mingguang armor from the wall.

"Mai Dong, I'll go extract vitamin C, and you continue to search for the old cat." Tang Yue got into the Mingguang armor and contacted Mai Dong while inspecting the cabin suit, "Notify me in time if you find anything." ”

"yes, I see."

Tang Yue bent down awkwardly, held the sink in his arms, looked around, and stopped for a moment, "I'm out, bye." ”