丁香高清视频在线看看I国产在线观看路线一I天天操天天弄I内射网站I在线看免费I亚洲国产中文色妇美女I国产欧美在线观看I91看国产I一区二区三区久久I久久激五月天综合精品I欧美性videos高清精品I在线一区二区I久久精品激情I久久久久亚洲天堂I欧美AAA视频I亚洲激情第一页I欧美人体大胆瓣开下部自慰照I国产亚洲精品AV一区二区

The 1. diameter is 0.1-1mm (100 micron to 1000 micron), and the particle size range can be adjusted.

2. uniform particle size distribution

3. good sphericity.

4. solid ball with smooth surface and good fluidity.

5. there is no concave and convex shape on the surface.

6. Qiao Feng patent product

7., especially for lead, bitumen, other metal materials, ceramic materials.