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¡°Call your uncle and ask him if the experiment location and equipment are ready.¡± I shouted to Ye Qian as soon as I entered the door.
"I called a long time ago and everything is ready." Ye Qian answered with a pout.
"How's your shooting?" I asked, tilting my head.
"Just average, third in the world." Ye Qian flicked her ponytail and said confidently.
"Oh, yes, I remembered, you are the shooting champion in your grade!" I flattered quickly.
"It's good to know." After being praised like this, Ye Qian grinned and felt much better.
"That's just right. My shooting skills are terrible, so please help me!" I said to her with a smile.
"I don't have time!" Ye Qian refused.
"Forget it, alas, I originally wanted to teach you some of my master's special skills." I pretended to be disappointed and walked to the exploration box.
"What? Special skills?" Upon hearing this, Ye Qian stood up from the chair, feeling energetic.
¡°Teach you how to see the modus operandi from the cracks in the glass!¡± I turned around and said to her.
"Is it really that powerful?" Ye Qian asked with stars twinkling in her eyes.
"Do you know who my master is? The first person in trace inspection in Baynan Province, what do you think?" I answered proudly, patting my chest.
"Okay, I saw that you were so sincere, so I went with you." After saying that, Ye Qian walked to me in a few steps and grabbed my survey box, as if she was afraid that I would regret it.
Half an hour later, Ye Qian and I arrived at the indoor shooting range of the Municipal Public Security Bureau. This shooting range is usually used for training by some front-line police officers. The entire shooting range is surrounded by sound-absorbing foam walls. At this time, a May 4th-style pistol and a box of ammunition were placed in front of us under the inventory of a senior from the Municipal Bureau.
Generally, when entering a shooting range for live-fire shooting, a special gun inspector will inspect the safety of the gun and only issue bullets after ensuring that the gun is foolproof. And when shooting, the number of bullets must match. To put it simply, the gun inspector assigned us 100 rounds of bullets, and 70 of them were consumed during the shooting process, and the remaining 30 rounds must be handed in. If you are found to be carrying bullets out without permission, you will be subject to severe disciplinary action.
"Si Yuanlong, according to the instructions of the leaders of the municipal bureau, you will be issued a May 4th-style pistol with 50 rounds of ammunition. After you count it, sign this list for me." Senior Brother said to me politely .
"Thank you, Senior Brother, for bothering you to make a trip so late." I apologetically picked up the record book in his hand and signed my name on it.
"You're welcome, I won't disturb your experiments. I'm right next door. If you have anything to do, please contact me at any time. Be sure to pay attention to safety." Senior Brother patted me on the shoulder and said with a smile.
"Okay, no problem." I answered cheerfully.
"Come on, Ye Qian, let's work." I picked up four windshields removed from the scrapped car from the ground and said to her.
"How to do this experiment?" Ye Qian shouted at my retreating back.
I placed the four pieces of glass on the ground 50 meters away from Ye Qian. After doing all this, I turned back to where I was and said, "I looked at the bullet holes on the car glass at the scene of the crime, and basically ruled out Possibility of parallel firing.¡±
"How did you judge?" Ye Qian looked at me curiously.
I didn't answer. I took out my phone from my pocket, pulled up the photo of the bullet hole, and said to her: "Look, the windshield of a car is made of tempered glass. After being shot, it won't break into pieces like ordinary glass." Broken. This kind of tempered glass will break into very small pieces after being impacted, so it is less likely to hurt people, so people usually call it safety glass."
¡°Due to the special nature of this glass, I can judge the angle of the suspect¡¯s shooting based on the lines of broken glass.¡±
"We all know that car windshields are basically installed at an angle. The advantage of this is that it can reduce drag. In addition, when driving at night, the oncoming lights will be reflected through the inclined glass surface, which will not Shining strong light into people's eyes can greatly improve driving safety."
"I asked you to tell me about the case, why are you telling me this?" Ye Qian asked impatiently.
I patted the dust on my hands, glanced at Ye Qian who was anxious, and replied with a smile: "Don't be anxious, I'm about to get to the point."
"Then hurry up!" Ye Qian urged.
I cleared my throat and replied: "I'mOn-site measurements showed that the angle of the windshield of the vehicle driven by the deceased was 55 degrees, so its parallel elevation angle to the ground was approximately 125 degrees. If the suspect shoots at eye level, the bullet hits the inclined glass surface parallelly. Due to the angle, the first point of impact should be the glass below the bullet hole. The glass below suffered a huge impact and would shatter badly, while the glass above the bullet hole was relatively intact. "
"But if you look at the shape of the glass near the bullet hole at the scene, the cracks on the top and bottom are almost the same, and the broken traces of the entire glass appear in concentric circles. Obviously this situation is not caused by parallel shooting."
"Then how did this form form?" Ye Qian replied with a frown.
"If I guess correctly, it should be caused by a vertical blow. This is like erecting a piece of glass on the ground. When the bullet is shot parallel to the glass, because there is no angle, the force at the point of incidence of the glass is the same. The fragmentation marks made in this way are very even, which is why this concentric circle appears." I answered seriously.
"You mean to use these pieces of glass tonight to confirm whether vertical shooting will create such concentric circles on the glass?" Ye Qian asked with a flash of inspiration.
"Smart!" I replied with a snap of my fingers.
"What a trivial thing!" Ye Qian said, grabbing the earmuffs on the shooting platform and trying to put them on her head.
"Wait a minute!" I quickly stopped her movement.
"What's wrong?" Ye Qian asked, tilting her head.
"Generally, the effective shooting distance of 7.62 mm caliber bullets is about 50 meters. Through on-site analysis, the suspect is likely to shoot within this distance range, so you have to control the shooting distance. You can stand here and It¡¯s almost done!¡± I took two steps forward, pointed to the ground with my toe and said.
Ye Qian glanced at her feet, nodded to me, picked up the black Type 54 pistol and began to test it. In order to prevent the gun from misfiring or jamming during shooting, inspecting the gun before shooting is a very important first step.
She held the pistol tightly with her right hand, opened the safety on the gun, removed the magazine, quickly pulled the slide of the gun up and down, and then reloaded the magazine. The entire gun inspection process took Ye Qian less than five seconds. It can be imagined how proficient she is with guns.
Then, she raised the pistol with her right hand, and her left hand naturally hung on the outside of her thigh. She closed her left eye slightly, and the sight, the notch on the gun, and her line of sight were quickly adjusted to a straight line.
Bang! Ye Qian pulled the trigger without any hesitation. After the first shot, the pistol was firmly in her hand.
"Awesome!" I gave her a thumbs up with great admiration. Only those who have played with guns know how difficult it is to shoot her.
First of all, Ye Qian holds the gun with one hand. Due to the weight of the gun, she must have a certain amount of arm strength to hold the gun steadily.
Secondly, the gun will produce a lot of recoil during the firing process. If she does not have a certain grabbing force, it is likely to cause the gun to shake up and down, making it difficult to hit the target.
Finally, it¡¯s her aiming speed. When shooting, you must keep your sight consistent with the aim and notch on the gun. Moreover, the May 4th-type pistol is different from a submachine gun. It does not mean to hit anywhere. To put it simply, if you use the May 4th pistol for target shooting and want to hit the tenth ring position, then you should aim not at the dot in the middle, but at the eighth ring position below the dot. If the distance is farther, this position needs to be change. Being able to aim at a target in a short time like Ye Qian would be impossible without long-term and rigorous training. That's why I admire her actions just now.
"Go and see if they are concentric circles." Ye Qian put down the pistol, took off the noise-cancelling earmuffs and said to me.
"Okay!" I ran to the windshield in a few steps, then opened the photo album on my phone and compared it with the experimental results.
Ye Qian¡¯s footsteps became clearer behind me:
"How's it going? Is there any result?"
"Yes, the cracks are almost the same, which confirms my judgment that the suspect stood on a plane perpendicular to the windshield and shot. I thought I would do it two more times, but I didn't expect you to do it in one go. !" I happily picked up the record book and said to her while recording the data of this experiment.
"Tch, do you think my shooting championship was just blown away?" Ye Qian confidently smoothed her bangs from her forehead.
"That's definitely not the case!" I wrote a data answer in my notebook.
"What does this number represent?" Ye Qian glanced at it curiously and asked.
I drew a circle on the number and explained: "The elevation angle of the car windshield measured on site is 125 degrees, then the angle between it and the inside of the car is 55 degrees. Given the angles of the two angles of a right triangle, then The remaining angle is 90 degrees minus 55 degrees, which is 35 degrees. In other words, the suspect was shooting while standing at an angle of 35 degrees to the ground."
"But just by determining the angle, doesn't it mean we still don't know the suspect's shooting position?" Ye Qian asked with a frown.
"You are wrong. Based on this, we can basically determine a range." I replied. (Remember the website address: www.hlnovel.com)The elevation angle of ? is 125 degrees, then the angle between it and the inside of the car is 55 degrees. Given the angles of the two angles of a right triangle, then the angle of the remaining angle is 90 degrees minus 55 degrees, that is 35 degrees. In other words, the suspect shot while standing at an angle of 35 degrees to the ground. "
"But just by determining the angle, doesn't it mean we still don't know the suspect's shooting position?" Ye Qian asked with a frown.
"You are wrong. Based on this, we can basically determine a range." I replied. (Remember the website address: www.hlnovel.com