久久久久亚洲AV色欲AV,18黑白丝水手服自慰喷水网站,精品熟女碰碰人人A久久,人人妻人人澡人人爽人人精品97

what differences are there? This is certainly not an equipment. The reason is that grinding machine refers to a device that can paste materials into a paste. Comparison with soybean milk machine is also considered.

Colloid mills, on the other hand, can crush higher fineness, but must be colloidal or watery and not hard. The colloid mill used in industry is composed of a rotor and a nail, and it is a special material and requires good wear resistance. It has its own pumping capacity. The degree of grinding can reach nanometer level.