The low temperature test chamber evaluates and determines the adaptability of electrical, electronic products or materials to non-heating electricians and electronic products subjected to temperature changes without causing damage at low temperatures. The low temperature test chamber can use forced air circulation to keep the temperature uniform. In order to limit the effects of radiation, the difference between the temperature of each part of the inner wall of the test chamber and the specified test temperature shall not exceed 8% (calculated according to Kelvin temperature), and the test sample shall not be directly irradiated by any heating and cooling elements that do not meet the above requirements.
The low temperature test chamber is machined and formed by a CNC machine tool, and has a reaction-free handle for easy operation. The inner bladder of the box is made of imported high-grade stainless steel mirror panel, and the outer shell is sprayed with A3 steel plate. The large observation window made of heat-insulated tempered glass can clearly observe the test conditions in the box at any time. The device is equipped with a 50mm diameter test hole for external test power or signal lines.
Relevant standards for low temperature test chambers: GB / T 2421-1999 Environmental testing for electrical and electronic products - Part 1: General (idtI EC 60068-1:1988); GB / T 2422-1995 Environmental test terminology for electrical and electronic products (eqvI EC 60068- 5-2:1990); GB / T 2424.1-1989 Basic Environmental Test Procedures for Electrical and Electronic Products Guide to High Temperature and Low Temperature Tests 
Oseltamivir Phosphate (Oseltamivir phosphate) is often referred to as "Tamiflu" (Tamiflu). Produced and sold by the Roche Group, launched in Switzerland in 1999, and launched in China in 2001. It is the most commonly used and one of the most effective drugs against avian influenza, H1N1 influenza virus and influenza B virus. Reducing the incidence of influenza complications can also reduce the use of other medicines, and Tamiflu can increase the survival rate of influenza patients by about 37%.
But it also has large side effects, especially for children. And its price is more expensive to take twice a day, 75mg each time, the retail price of medicines is equivalent to 60 yuan per day, and a course of 5 days is equivalent to about 300 yuan. In addition, taking Tamiflu before the flu has no preventive effect on flu.
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