2. The glass surface is smooth and easy to clean, especially bacteria and dirt. It is not easy to breed on the glass wall, so drinking water from a glass is very healthy and safe. Ceramic cups and glasses have similar characteristics, but many ceramic cups are easy to add harmful glaze during firing, which easily leads to excessive lead content. Therefore, in the selection process, glass cups are the best, followed by ceramic cups.
1. opened a fitness course.
Because each school has different ability to run a school, and physics class needs special classrooms and equipment (such as s