Guan Zheng is like an encyclopedia: "The Doppler effect is named in honor of the Austrian physicist and mathematician Christian Johann Doppler, who first proposed the theory in 1842." The main content of the www.biquge.info is that the wavelength of the radiation of an object changes due to the relative motion of the wave source and the observer.

In front of the moving wave source, the wave is compressed, the wavelength becomes shorter, and the frequency becomes higher; When behind a moving wave source, the opposite effect is produced. The wavelength becomes longer and the frequency becomes lower; The higher the velocity of the wave source, the greater the effect. Depending on the degree of wave shift, the velocity of the wave source in the direction of observation can be calculated. ”

"Speak human words!" Jiuyan didn't have time to listen to this nonsense.

Guan Zheng explained: "For example, when an ambulance is approaching, the sound is getting louder and louder; And as the car left, the sound became lower and lower. You may not realize that this phenomenon belongs to the same principle as the color ultrasound used in hospitals, that is, the Doppler effect. ”

"Didn't I know you said that? It was found that there were twelve places that met the requirements. "Xu Jiuyan's work efficiency is still very high.

Guan Zheng was still a little disappointed, although there were only twelve places, but it would take at least a few days to investigate them one by one, and Qian Fatzi couldn't wait at all.

Xu Jiuyan put on headphones and listened to the noise, why couldn't she hear anything clearly? Xu Jiuyan said a little dejectedly: "Why can't I hear anything? ”

"That's because you're inexperienced." Guan Zheng randomly began to ponder: Why was he kidnapped? Where was it kidnapped? What is the purpose of kidnapping? Why is no one asking for ransom?

Xu Jiuyan and Guan Zheng have a higher and higher degree of tacit understanding, Xu Jiuyan took the walking route of the fat man after leaving the police station, but there was a hand left in the video.

Xu Jiuyan pushed the computer to Guan Zheng and said, "Look at this, is this hand injured?" ”

Guan Zheng nodded and said, "Yes, but where did this hand come from?" ”

"What was found in the video of the kidnapping of the fat man, I didn't see my face, I only had one hand."

Guan Zheng looked at the hand and said, "It looks like it was scratched by a sharp weapon." But how do you tell that this is the kidnapper's hand? ”

"Judging from the previous paragraph, this person is dodging the camera, and the sneaky person must not be well-intentioned!"

Guan Zheng blinked and said, "Although your reasons are very one-sided, your inference is correct. ”

Xu Jiuyan leaned on the table and said, "We don't even know where the hostages are now, how can we arrest people?" ”

"Who says we don't know? We're looking for it. Guan Zhengzheng said, Guan Nuo received a new video here. The fat man in the video is even more dangerous, and his face is already purple.

Guan Zheng was also more anxious and asked, "Have you found the IP address?" ”

"Checked, in New Zealand, he hijacked Internet IP addresses around the world, and sent any files wantonly without being traced to the real address. I'm sorry I didn't help you. ”

Guan Zheng patted Guan Nuo's shoulder and said, "This is normal, I don't blame you." If this address was so easy to find out, we would have caught this person a long time ago, and we still have to drag it out until now? ”

The phone in the office also rang, and Guan Zheng sent Xu Jiuyan to answer the phone, Xu Jiuyan glanced at Guan Zheng and said, "You really treat me as a little secretary?" ”

Xu Jiuyan picked up the phone angrily: "The Criminal Police Brigade of the Municipal Public Security Bureau." ”

"Hello, we are the Economic Investigation Brigade, the insurance bills and policies you provide have been analyzed, can you come to get the summary report? We just don't have enough people on our side. ”

Xu Jiuyan instantly came to her senses and said, "Okay, I'll go right away." ”

Xu Jiuyan put a stack of documents on the table, and Guan Zheng asked, "What do you say?" ”

"The bill is normal, and the policy is legitimate."

Guan Zheng took a deep breath, it was like this again! Guan Zheng knew that if it dragged on like this, Qian Fat Man would have no chance of surviving at all, so he got up and said: "Li Chongyang, Xiaoquan'er, Lao You, Jia Zhenkai, a few of you go to visit and see if the twelve places on this map can be narrowed down and determine the location as soon as possible." Guan Nuo continued to extract ambient sounds and sift through clues. Xu Jiuyan and I went to the insurance company again. ”

Guan Zheng and Xu Jiuyan went to the insurance company, but the scene they faced was still an office area with a few employees. Guan Zheng grabbed a cleaner and asked, "How many people are in your company?" ”

"Well, plus the general manager, there are 27 people."

"Twenty-seven? Are you sure? ”

The cleaner said firmly, "Of course, do I need to lie to you?" ”

Xu Jiuyan was a little unbelievable, the registration license was clearly written as 270 people, but what about this employee? How did it become 27 people?

Guan Zheng said: "It seems that there are still many things we don't know about this insurance company. ”

"yes, the salesman from last time was also tired, right?"

Guan Zheng nodded and said, "You just know?" The reaction is slow! ”

Xu Jiuyan rolled her eyes and said, "You're amazing!" Xu Jiuyan went to the front desk and said, "Girl, I want to buy insurance." ”

The receptionist smiled and said, "Okay, we will have an excellent salesman to answer for you." ”

Within a few minutes, a small thin man came out, this thin man was really not good-looking, two cheekbones rose high, and thick lips looked like a big-mouthed monkey.

Xu Jiuyan pulled Guan Zheng to sit down and said, "I want to buy an insurance." ”

"What do you want? Accident insurance? Health insurance? Or property insurance, life insurance, liability insurance, credit insurance? Or subsidy insurance, marine insurance? The salesman spouted and impersonated, Guan Zheng was no longer interested, but Xu Jiuyan listened to it and said: "I want personal insurance, preferably the insurance for my children and grandchildren." ”

The big-mouthed monkey instantly exuded a cunning look and said, "Madam, you are right, this descendant is the hottest insurance for us here." You think, you buy an insurance, as long as you pass away, I don't mean anything else, just for example, whether it's an accident, illness, or whatever, anyway, only you die, your husbands, I'm sorry it's your husband, the children will inherit your insurance, and they will become beneficiaries. And it's been passed down ever since. ”

If Xu Jiuyan was an outsider, she almost believed it, and the big-mouthed monkey said that Xu Jiuyan was a little tempted.

Xu Jiuyan nodded, praised again and again, and said, "Then how much money is this insurance?" ”

"3 million, you don't lose. Think about it, you're gone, and your children and grandchildren are still benefiting! ”

Xu Jiuyan asked rhetorically: "Isn't it 2 million?" The price has risen again? ”