... Application: For daily use items such as gold and silver jewelry, jewelry, headgear, brooches, glasses, bracelets, fountain pens, CDs, shaving knives, ... other hand can also be used to conduct ultrasonic skin care, long-term use can maintain elasticity of the skin is ... all make this world the truth Xian exhaustive.3, jade, jewelry processing industry: In the grinding polishing process, a large number ...