Quartz is natural abrasive.
举一反三
- In() a single layer of abrasive grains is bonded with an adhesive to flexible or semirigid backings. A: natural abrasives B: conventional abrasives C: superabrasives D: coated abrasives
- quartz
- Is quartz a mineral?
- Smoky quartz is the quartz contains trace amounts of: A: Al B: Fe C: Ca D: Mg
- What are the the form of silica？ A: alpha quartz B: beta quartz C: tridymite D: Normal atmospheric dusts