Many people may ask why eyeglasses are so expensive
Firstly, when it comes to selecting the frames, I suggest you choose a branded one. You can visit the local shops to choose which one you like. I used to a famous optical shop where a frames priced 3000 Yuan while 700 online. Very ridiculous, isn't it? Once you decided which one you what to buy, you should remember the numbers of the frame. Then you can order it online.
As we know, once you enter an optical shop, there's people recommend many branded lenses to you such as Zeiss, Nikon, and Essillor. They are not bad but priced too high while that online are much cheaper. However, many lenses company do not allow them to be sold online, so it is reasonable that some online optical shops tell you they can not send you lenses with original package. Therefore you may worry about the quality of your lenses. However, choosing a reputable online optical store can expel your doubts.
When it comes to the accuracy of your prescription online, there is no reason to worry about in that you can get your latest prescription from your eye doctor after a vision test. You may say that many optical shops do not offer your prescription before making sure you buy eyeglasses there. Easy to solve! You can directly go to Eye hospital to get what you want at little cost. And then happily order what you want from online optical shops.
Now, you may ask me to recommend some reputable online optical shops to you. If I really do it, some people may say that I am here to advertise. So I'd better say nothing about that. In fact you can get some useful information from some online micro blogs.
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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