外观洁白，多棱角，无粉末积附于石英砂表面。

Appearance white, more edges and corners, without powder product attached to quartz sand surface.

youdao

外观洁白，多棱角，无粉末积附于石英砂表面。

Appearance white, more edges and corners, without powder product attached to quartz sand surface.

youdao