The liquid nitrogen tank is a low-temperature container that can only store liquid nitrogen and cannot store other liquids. It is mainly composed of inner and outer gallbladders, neck tubes,…
In laboratories, the most common experimental objects are cells. The safety of cells is related to the accuracy of experimental results. Therefore, they need to be stored in a low-temperature environm…
Application of maifan stone:1.. for soil improvement, reduce fertilizer use, absorb the residual pesticides and toxic substances in the soil, release the mineralization quality, improve the ecological…
The car History :
In1771, france to the new design a steam engine tricycle ;
In 1860, a frenchman renault making out with coal gas fuel for car engine ;
In 1885, the germans th…
The car History :
In1771, france to the new design a steam engine tricycle ;
In 1860, a frenchman renault making out with coal gas fuel for car engine ;
In 1885, the germans th…
The car History :
In1771, france to the new design a steam engine tricycle ;
In 1860, a frenchman renault making out with coal gas fuel for car engine ;
In 1885, the germans th…
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