Eéra handmade double necklace made of 925 silver. It features a hand-painted finished chain and a removable pearl insert. Accessory Length = 87 ...
In the animal husbandry industry, some friends who are improving frozen semen usually choose to use liquid nitrogen tanks to store frozen semen. Because when breeding, there will be problems with the distance between the breeding objects. The distance is far. Due to the ...
Currently, the technology of using liquid nitrogen to freeze animal semen for artificial insemination has been widely used in livestock production. Because the temperature of liquid nitrogen is -196°C, and its boiling point is low, it is easy to volatilize and is difficult to ...