Caviar, also known as caviar, pickled eggs such as salmon eggs and salmon eggs. In Persian, it means fish eggs. Strictly speaking, only salmon eggs can be called caviar. Carp caviar has rich nutritional and medical value....

　When producing and manufacturing freeze dryers, the compressor should be selected as such 1. In order to prevent the pressure in the front tank evaporator from rising due to the closing of the electromagnetic valve, the temperature adjustment effect is not guaranteed, and the technician adds a steam return pipe to the steam return line in front of the electromagnetic valve, and is connected to The two-stage compressed suction pipe of the refrigeration compressor proves that this treatment scheme is feasible through the practice on multiple freeze dryers....

It is well known that when using the freeze dryer for the first time, we must thoroughly clean all parts of the dryer. Everyone knows that stainless steel parts are cleaned with ethanol, and plexiglass is washed with physiological saline. Ampoules are cleaned with an ultrasonic cleaner, but what preparations do we need to make before actually operating the freeze dryer?...