【单选题】【消耗次数:1】
( )效率高,可以单面研磨,也可以双面研磨
机械研磨
手工研磨
嵌砂研磨
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①  正确
②  错误
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【单选题】 矿物抵抗刻划、研磨的能力称为矿物的( )。
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【单选题】 In Henry James’ The Portrait of A Lady, the author tries to portray the young woman as an embodiment of ______.
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