Is mercury coated on the inside of the thermos? Why is the small protrusion at the bottom broken and cannot be kept warm? The secret of the heat preservation of the thermos is mainly the double-layer glass inner liner.

thermos have been used in many companies and enterprises. However, employees may not fully understand the thermos. In this article, I will introduce the knowledge of thermos to a certain extent. I hope that after reading this article, the information obtained is helpful to you. l The manufacturing p

The insulation principle of thermos.thermos have been used in many companies and enterprises. However, employees may not fully understand the thermos. In this article, I will introduce the knowledge of thermos to a certain extent. I hope that after reading this article, the information obtained is h

thermos have been used in many companies and enterprises. However, employees may not fully understand the real thermos. In this article, I will introduce the knowledge of thermos to a certain extent. I hope that after reading this article, the information obtained is helpful to you. l Precautions fo

thermos have been used in many companies and enterprises. However, employees may not fully understand the thermos. In this article, I will introduce the knowledge of thermos to a certain extent. I hope that after reading this article, the information obtained is helpful to you. l Introduction of the