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问题: diamond后这句怎么理解?

Diamonds cut through solid rock in research of oil.Dentists use diamonds too often___48__a powder glued to paper or a wheel.
48.A.with B.polish C.as D.like
答案给的C,as a powder glued to paper or a wheel.怎么理解?

解答:

wheel是医生用的砂轮,paper好像是咬合纸,是不是上面用了钻石粉?