• 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

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