"Are you so sure?" Zhao Yuqing frowned slightly, and muttered to himself: "I don't know how you got so much information, what kind of disguise spy is even more unbelievable than a novel." Pen "Fun" Pavilion www.biquge.info"

Yang Tianfeng smiled noncommittally, lowered his head and continued to look at the documents in front of him.

Zhao Yuqing seemed to be thinking, and suddenly said after a while: "The grace of saving your life, you promise it with your body, this is reasonable!" ”

Well? Yang Tianfeng raised his head suddenly, looked at Zhao Yuqing, his expression slowly changed from stunned to natural, he understood, this girl finally knew what her sister was trying to hide.

"General Yang, if you can save my sister, and she is willing, then, then I don't care about your affairs!" Zhao Yuqing finally revealed her true appearance, and her eye-rolling demeanor showed that she was still the little girl with little experience.

"yes, if she's willing." Yang Tianfeng smiled slightly and said, "What kind of life-saving grace, I don't have this idea." As before, your sister is free, whether she stays or leaves, and no one interferes. ”

"My sister-" Zhao Yuqing sighed softly and said, "If her illness is cured, I think she wants to stay, although she didn't say so." It's just that this matter can't be known to the family first. ”

"Then you can help cover it up!" Yang Tianfeng poured a cup of tea for his sister-in-law with a smile and handed it over, "How did you know, your sister told you?" ”

Zhao Yuqing took the teacup, didn't drink it immediately, smiled slyly, and said, "What you two said in the house, I heard a few words outside. My sister, without cheating, was bluffed by me, and said it all. After a pause, Zhao Yuqing suddenly became a little gloomy, "My sister may feel that she can't get better, so she doesn't have to bother hiding it from me." ”

"The disease can be cured, and I am seventy or eighty percent sure." Yang Tianfeng first comforted him, and then said: "You can rest assured, go and accompany your sister." Or go to rest, you look a little tired, these days are definitely hard. ”

"I'll wait a little longer, maybe the medicine will be made in advance!" Zhao Yuqing said: "General Yang, you are busy with you, I will sit here and not disturb you, right?" ”

Yang Tianfeng nodded lightly and continued to look through the documents.

Rocket artillery has the characteristics of simple structure, fierce firepower, high rate of fire, fast response and good surprise attack. Compared to other artillery, rocket artillery can quickly dump large amounts of explosives at the target site. Although it is less accurate and has a longer reload time, it is inexpensive and easy to produce.

In Yang Tianfeng's view, low price and ease of production are the focus of his attention. Compared with barreled artillery of the same caliber, rocket artillery is extremely cost-effective (the cost is equivalent to 1/3 to 1/20 of the same caliber artillery). As for precision, Yang Tianfeng believes that this is not the point. How can there be anything better than a barreled artillery that is cheaper and easier to build, and can also achieve the accuracy of the barreled artillery?

However, Germany has taken detours in many places in terms of weapons research and development and equipment, and its technology is too refined and the pursuit of perfection is too much, but it has been defeated by a large number of weapons refined and indiscriminately manufactured by Maozi. For example, rocket artillery, due to its superiority in the field of rocket engines, the Germans paid more attention to long-range precision strikes of heavy rockets.

Obviously, such a requirement made it difficult for the speed and quantity of weapons to meet the requirements for victory in the war, and it was a little too late to change course until the middle and late stages of the war, when Germany lacked war resources.

Of course, Yang Tianfeng will not follow the mistakes of Germany, and according to the production and manufacturing level of the arsenal, he will borrow more weapons from the Soviet Union.

Solid fuel, in the eyes of others, is the cutting-edge of science and technology, requiring thousands of formulas and experiments, but for Yang Tianfeng, this kind of scientific and technological achievements that do not rely on hardware facilities are something he can easily come by.

The use of solid fuels eliminates the need for pump transfer systems with liquid fuels. The main structure of the rocket engine is the ignition device, combustion chamber, and nozzle, which is much simpler than the conventional engine of automobiles and motorcycles.

Although the structure is extremely simple, there are still difficulties. Because the combustion chamber is subjected to high temperatures and pressures when the propellant is burned, the nozzle is also ablative, so it is necessary to use high-strength alloy steel, or to be equipped with a thermal insulation lining and sprayed ablative material.

Am I not making it clear? Yang Tianfeng did not immediately set out to solve the difficulties raised by the arsenal, but touched his chin and thought about it.

Rocket artillery is not the kind of high-tech rocket used to launch satellites. The flight time is very short, and the special steel currently produced and manufactured should be able to meet the requirements, right?

After thinking for a while, Yang Tianfeng somewhat understood that the arsenal must be doing a static experiment, not a live-fire test. In this case, the technician may ignore the flight time of the rocket and only see that the combustion chamber is burned out and the nozzle is also ablated under high temperature and pressure.

Although this did not need to be solved immediately, Yang Tianfeng still picked up the pen and wanted to write down the spraying material containing graphite, and gave the technicians of the arsenal a reminder that they did not need to be too strict.

"Oh, that's written—"

Yang Tianfeng looked up in amazement and found that Zhao Yuqing had not left, and was still sitting there, pouting and commenting on his words.

"You say, I write." Zhao Yuqing unceremoniously took the job for himself, "Who made you hurt, write it with your left hand...... Tsk, don't make people laugh to death! ”

"Your sister's side—" Yang Tianfeng gestured with his hand, "Who is taking care of it?" ”

"Zhai Xiu'er, tofu Shih Tzu." Zhao Yuqing bowed slightly, said on his lips, took all the paper and pen in his hand, sat upright, and shook the pen, "Say, I'm ready." ”

Yang Tianfeng smiled helplessly, sorted out his thoughts, and spoke slowly.

"Hurry up, I can keep up."

Oh, this girl is—Yang Tianfeng rolled his eyes slightly.

………….

The sun rose in mid-air, and the sunlight shone on Zhao Yurou's face through the window paper. She slowly opened her eyes, woke up for a while, turned her face sideways, and found her sister lying next to her, sleeping sweetly, with a hint of a smile on her face.

She gradually remembered what happened at night, it was Zhai Xiu'er who was taking care of her, and she remembered that the fever was very uncomfortable, and it seemed that when it was almost dawn, a doctor came to give her an injection.

The door creaked open, and Zhao Yurou narrowed her eyes and looked secretly.

Yang Tianfeng walked in lightly, observed Zhao Yurou's state, and reached out to test the temperature of her forehead. When he wanted to turn around and leave, he found that Zhao Yurou had already opened her eyes wide, frowned slightly, and was staring at him.

"Hehe, you sister." Yang Tianfeng pointed at Zhao Yuqing with a smile and said in a low voice, "It's full of fun." Well, I gave you an injection, and a course of treatment is six days, which should be cured. By the way, I've called someone to take care of you, she doesn't have to be so tired, and I have a lot to deal with. But I'm not going to leave for a few days, so I'm here to contact the guide by phone. ”

Zhao Yurou pursed the corners of her mouth and glanced at Zhao Yuqing, nodded lightly, and said, "You are busy with your go, there are so many things to deal with, you can't do it without you." Don't keep caring about me, big man, it's a joke. Well, did you really make a special drug? ”

Yang Tianfeng nodded and said, "As long as it is not a rare antimony patient, the effect can still be guaranteed." Of course, this will take time to verify. As for you, that's a bit hard to say. ”

"A dead horse is a live horse doctor." Zhao Yurou was very understanding, smiled a little, and said: "Whether to watch the patient die, or to try boldly, this choice is not difficult." ”

Yang Tianfeng shook Zhao Yurou's little hand and said, "You can see it, that's the best." I asked the doctor to check more, do more tests, eat more foods containing vitamin B and vitamin C, and if you have anemia, you should also transfuse fresh blood. Hehe, you said that it was quite a coincidence, our blood types are the same. ”

Zhao Yurou wanted to speak, but felt that her throat was a little choked, so she had to smile reluctantly, and by the way, she covered up the dampness in her eyes.

"Rest well. Those two girls are almost here, your sister, sleeping like a pig, a little unreliable. Yang Tianfeng smiled and pinched the soft leaf hard, turned around and walked out.

Zhao Yurou was lying on the bed, blinking her eyes slowly, her heart was full of mixed feelings, and it was difficult to calm down for a while, and she heard a muffled hum coming from the side.

Zhao Yuqing's mouth was so pouting that he could tie the oil bottle, his eyes were open, and he was sulking.

"Yuqing, you're awake, why are you pouting, why are you unhappy?" Zhao Yurou asked with a sideways face.

"Humph! He even said that he was a piglet. Zhao Yuqing got up and said angrily.

"Huh." Zhao Yurou smiled: "It's a joke, why take it seriously." ”

Zhao Yuqing rolled her eyes and said, "Sister, if it weren't for him to save you, I wouldn't have agreed to the two of you, so I would have taken you back to Kunming and let my parents teach you a lesson." ”

Zhao Yurou sighed and said, "You, you're still too young, and you don't understand many things." Although I have a nominal relationship with him, Yang Tianfeng is not strong, I am free to come and go. Men have good faces, and I want to stay, so naturally I have to maintain a nominal relationship and not let people talk about him behind my back. ”

Zhao Yuqing blinked and thought about it, and said, "Sister, I think he cares about you very much, you, that, don't seem to hate him either." Otherwise, why would he touch your head and pinch your hands, and you wouldn't be angry. If you want me to say, since he promised to win the Anti-Japanese War, it's okay for you to mess around like this, right? ”

"I, I don't know." Zhao Yurou smiled bitterly and said, "Otherwise, when I get better, let's go to Kunming." Sometimes it's really annoying to think about these things. ”

Zhao Yuqing didn't understand very much, she just nodded according to her sister's meaning, and after a pause, she let out a heartfelt admiration, "Yang Tianfeng is really powerful, it seems that he can do anything." The difficulties that others can't solve even if they want to break their heads, he doesn't even think about it, well, sometimes he thinks about it. Solutions can be found. You say that he traveled and studied in foreign countries, spying and stealing, but I don't believe it. Even if someone else takes the information for him to see and memorize, he can't remember it so clearly, so much, right? ”

Zhao Yurou frowned slightly, and said thoughtfully: "I also have such doubts, but I may not be able to think of anything else." ”

"This guy must have something to hide." Zhao Yuqing narrowed his eyes, tilted his head, and snorted, "I have to find out." ”

Zhao Yurou looked at her sister's appearance and laughed softly, her knowledge, experience, and psychological maturity are not as good as Yang Tianfeng, and she still wants to be a big detective?

…………… (To be continued.) )