1. Polyurethane resin: It has the characteristics of high strength, high hardness, corrosion resistance and oxidation resistance.
2. Additives: Commonly used additives include calcium stearate and silicon dioxide, which can increase the luster and protective performance of piano paint.
3. Polishing agent: A colorless, transparent, odorless, nontoxic and nonflammable liquid, which is used to improve the gloss of piano paint surface.
What courses are there for primary education majors?
1, main course
The main courses offered are: general pedagogy, moral principles, edu