• 2022-10-28 问题

    Quartz is natural abrasive.

    Quartz is natural abrasive.

  • 2022-06-15 问题

    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

    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

  • 1