2 After the patent period runs out, the invention enters the public ______, which means that anyone can freely produce and sell the invention without paying the prior patent holder. Choose the one word that best completes the above sentence:
(A) order
(B) policy
(C) interest
(D) domain
答案:登入後查看
統計: A(0), B(0), C(1), D(3), E(0) #1231307
統計: A(0), B(0), C(1), D(3), E(0) #1231307