1, selenium-enriched kettle has national patent.
2. Sekangyuan selenium-enriched purple sand cup is the only one in China that cooperates with Southeast University to implant organic selenium into purple sand.
3. It can not only purify water, but also eliminate pesticide residues and heavy metals such as lead, mercury and chromium in water.
Self-improvement star speech 1
Dear teachers and students:
Good evening everyone. I am Sun Peiqiu from Class 3, Grade 07, and my major is Materi