Video surveillance system has always been a hot topic in the field of surveillance. It is widely used in various industries such as: transportation, electricity, co…
If you need to achieve remote monitoring across regions, you should choose the network video surveillance system. Of course, some hard disk video recorders also have the function of network transmission. However, hard dis…
The phenomenon of the positive temperature coefficient of resistance (PTC) of the composite material formed by adding conductive carbon black to the polymer matrix as the matrix was first discovered by Frydman in 1945. In recent years, polymer PTC materials are…
In the second half of the 15th year, two films, an old gun, a small era, the old gun coordinates Beijing, and the small era coordinates Shanghai, when we watch movies, it is not difficult to find the differences in climate and culture, since ancient times There are differences in all aspec…
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Ash solid wood furniture is harder and more wearable than pine furniture. Compared with mahogany furniture, it is affordable and friendly. In furniture decoration, Fraxinus mandshurica is a relatively common wood for us, its mat…