問題詳情

4 The International Patent Classification, commonly referred to as the IPC, is a ＿＿＿＿＿＿system in which the wholearea of technology is divided into a range of sections, classes, subclasses and groups. There are eight sectionsthat are broken down into classes and subclasses. Choose the one that best completes the above sentence:
(A)analogical domical
(B) hierarchical
(C) vortical
(D)

參考答案

答案：C
難度：非常困難0
統計：A(1),B(0),C(0),D(1),E(0)