欧美性zoo_夜夜摸日日操_大胆顶级欧美aaa级_经典av三级_成人视屏在线_一级 黄 色 片69

The NH120 double-tapered roller mixer uses two tapered rollers to crush and mix the abrasives, which can effectively eliminate the rolling and heating of the materials during the rolling process. The mechanical transmission adopts the worm gear method, and the large worm wheel made by aluminum-based rare earth alloy material, which has good wear resistance and durability.