二、Duke owns a patent which will not expire until 2020. For some reason, Duke decides to give up

問題詳情

二、Duke owns a patent which will not expire until 2020. For some reason, Duke decides to give uphis patent right. How would Duke do so?(20 分)

答案：C
難度：適中0.641304
統計：A(10),B(7),C(59),D(5),E(0)