There are many precautions in the use of liquid nitrogen tanks. Liquid nitrogen tanks are used to store semen or cells, and it has excellent freezing performance. The liquid nitrogen tank is in a high vacuum between the inner and outer shells, and has multiple layers of thermal insulation materials. Opening the evacuating nozzle will immediately lead to the deterioration of the container, and the liquid nitrogen tank will no longer be used. Therefore, the user cannot open the evacuating nozzle above the liquid nitrogen tank. 

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