15 Under the R.O.C. Patent Act, where the term of an invention patent has expired, the patent should
become ____ .
(A) an extinguisher
(B) non-existed
(C) extinguished
(D) distinguished
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統計: A(1), B(2), C(5), D(1), E(0) #3297991
統計: A(1), B(2), C(5), D(1), E(0) #3297991