"Who can do senior three, math, do me a favor, I can pay..." at more than 3 p.m. on June 7, such a few words suddenly appeared in a QQ group chat. It's normal to offer a reward on the Internet. But at more than 5 o'clock, several group friends who had just finished the exam looked more familiar with these topics. Finally, I suddenly found that Zhuo, this is not the college entrance examination question I met in the afternoon!?
What's more outrageous is that everyone found that the topic was sent at 3:48 p.m.
At this point, aren't you taking a math exam... Well, the truth of the matter is that everyone thinks that someone cheated in the college entrance examination. After the chat records were exposed and searched, the official gave a reply soon. The examinee's score is invalid and he can no longer take the follow-up college entrance examination. The follow-up processing will be notified in time.
This is probably the case. I don't know what people think. Anyway, Shichao is a little worried. How did the mobile phone get into the examination room? How did the examinee take photos without being found? Let's not talk about these two first. Let's discuss with you: How did he send photos? Aren't there signal shielding in the examination room... The reason why Shichao can think of is the same as that a candidate photographed the college entrance examination questions to the search question app last year - the 5g signal was not shielded well.
To understand this problem, let's first understand the principle of signal shielding. Generally speaking, signal shielding is to transmit high-power noise signals to the signal frequency band of the mobile phone, interfere with the connection between the mobile phone and the base station, and block the signal.
It's like two people are communicating normally. If you set off firecrackers next to them, they can't hear clearly. Therefore, as long as the nearby mobile phones or other communication devices are covered by noise signals, they will be subject to certain interference.
Note: there is a premise. It must be aligned with the signal frequency band of the equipment. If you want to shield 4G signals, you have to send noise signals to the 4G frequency band, and other frequency bands will not be affected. Let's look at the 2G to 4G frequency bands of China Mobile, including 900MHz, 1800MHz, 2GHz, 1.9GHz, 2.3ghz and 2.6GHz.
While 5g shares 2.6GHz with 4G, there are still some independent bands of 4.9ghz. The problem is that if there are some old signal shielding devices, they only support 2G, 3G, 4G and other frequency bands.
Once a mobile phone uses the 4.9ghz independent 5g frequency band for communication, it will not be affected by these old shielding devices... Because the cheating happened in Gansu Province, Shichao also went to the relevant websites and found that they were purchasing 5g shielding devices, which seemed to be a little behind.
Take Lanzhou for example. According to the public information, Lanzhou Education Examination Institute issued a bidding announcement on May 27 that "5g signal shielding is urgently needed for the purchase of college entrance examination".
Data source: baizhongxun ▼
Although it says "urgent need", its bid opening date is set for June 21, after the college entrance examination this year. Apart from this, the examination institute has no bidding information in the past two years. If the public information is complete, that is to say, after 5g is commercially available in 2019, from 2020 to 2022, it is hard to say whether Lanzhou education examination institute has a shielding instrument that can shield 5g...
Of course, you should say that they can borrow from other universities or buy an undisclosed one. These are all possible. Shichao just has a reasonable doubt. There is another case except that the shield version is not up to date. If the mobile phone signal is particularly strong and has good anti-interference ability, it will also break through the signal shielding equipment. You know, there are already mobile phones that can achieve microwave transmission and anti-interference on the basis of 5g, and can even independently adjust the signal transmission power to ensure the stability of transmission.
Moreover, some civil signal jammers do not have much interference. In such a strong signal environment near the base station, or when the mobile phone signal is too good, the signal shielding will be discounted. In a word, even if the signal shielding method is used, the mobile phone will still have a signal under certain circumstances. This may be the reason why candidates can send pictures from the examination room.
But in this case, we can not simply throw the pot onto the signal shield. This year, the Ministry of education also issued a special notice: in view of the new situation of 5g mobile phone cheating, this year's college entrance examination will strictly enforce the admission inspection of candidates and invigilation in the examination room, promote the centralized management of mobile phones, ensure the normal operation of shielding equipment, and strive to ensure that mobile phones can not be brought in, hidden, used or transmitted through various means such as civil air defense, material defense and technical defense. I just want to ask.
How did the candidate bring his mobile phone into the examination room? Why didn't the security check find out? Shichao shook his hands during the exam. How could he take such a clear picture? Can't the camera and the invigilator see such a big action?
Look at the photos carefully. It seems that they were taken on the table
Besides the examinee who was found, did anyone else bring their mobile phones into the examination room? All of us want to know the answers to these questions, and we also hope that the authorities can thoroughly investigate them.
As we all know, the college entrance examination papers are escorted by the police car and positioned by GPS. Each examination room is also equipped with surveillance cameras, signal shielding devices, 2-3 invigilators and patrol groups from time to time.
What is the reason why the society has made such great efforts in the area of secrets? In order not to make mistakes, in order to be absolutely fair.
For thousands of children from ordinary families, if they have no background and resources, they can prove their value and have the opportunity to stand out.
Nothing else, just the college entrance examination. The college entrance examination determines the life of most people in the next 20 or 30 years. No one should take shortcuts on this road.
If someone wants to carve a crack in this sacred road. Whether it is cheating candidates, or the work is not in place, or even the relevant personnel who may cover up. This account must be calculated carefully.