... lip line curving .Special features: 1. Surpass the display screen of big liquid crystal. 2. Surpass 6 groups of storage elements, article ... The characteristics of ultrasonic(1) ultrasound can be in gas, liquid, solid, solid-melt and other effective communication media.(2) ... superposition and resonance phenomena.(4) The spread of ultrasound in liquid media, it can at the interface to generate a strong ...