It is about six months since I graduated from university
Although six months are not long, I have done my second job. However, I have to sit at the computer all the day. Gradually, I feel that my eyes are not comfortable and dry. And I find that they symptoms are becoming more and more serious. In order to deal with the situation, I have taken many measures. For example, I drink tea often and put a cactus aside my computer. But I don't work at all.
Now, computers have been widely used. And many people have to work sitting in front of the computers. Can't they have the same feeling as me? I doubt. It is investigated that long time working at the computer will result in eye strain, dry eyes and even headache, which is called computer vision syndrome (short for CVS).
Then how can we computer users avoid these problems? Besides we need to pay attention to eye care, we also need computer glasses according to one of my friend, who is a professional eye doctor. It seems that I am a back number. He tells me that computer glasses are the glasses that are particularly designed for computer users. And they will help regular computer users to the great extent. I feel very happy when hearing of the good news.
Really, I am in need of a pair of high quality computer glasses. Otherwise, I don't know what my eyes will look like. Many people like me can resort to these glasses as well.
Hydraulic universal testing machines have very high accuracy requirements.
The hydraulic system is the power drive mechanism of the tensile testing machine.
The specific application of the electronic universal testing machine in the automobile manufacturing process: The electronic universal testing machine needs to be used for automobile parts.
Wave soldering refers to the molten solder (lead-tin alloy), sprayed by electric pump or electromagnetic pump into the solder wave required by the design, can also be formed by injecting nitrogen into the solder pool, so that it is pre-loaded The printed board of the component realizes the soft soldering of the mechanical and electrical connection between the solder end or the pin of the component and the pad of the printed board through the solder wave.
The frequency converter is a power control equipment that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's working power supply.
Electronic universal testing machine is a necessary equipment to control the quality of products.
The calibration operation of the electronic universal testing machine is still relatively unfamiliar to friends who use it for the first time.
Selective wave soldering defects and their prevention.
Testing machine, broadly speaking, is an instrument that verifies the quality or performance of a product or material according to the design requirements before it is put into use.
The tensile force is not an accurate value after being measured by the testing machine, and subsequent calculations are required to get the desired value.
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