As early as in 1647 Ohio made a decision that flee, tax-supported schools must be established in every town to have 50 households or more.（）
| When an invention is made, the inventor
has three possible courses of action open to him: he can give the invention to
the world by publishing it, keep the idea secret, or patent it. A granted patent is the result of a bargain made between an inventor and the state, by which the inventor gets a limited period of monopoly (垄断) and publishes full details of his invention to the public after that period terminates (终止). Only in most exceptional circumstances is the life-span of a patent extended to alter this normal process of events. The longest extension ever granted was to Georges Valensi: his 1939 patent for color TV receiver circuitry was extended until 1971 because for most of the patent’s normal life there was no color TV to receive and thus no hope of reward for the invention. Because a patent remains permanentl A. an approach to patents B. the application for patents C. the use of patents D. the access to patents [判断题]The declaration of import goods shall be made to the Customs by the importer within ______ days from the date of the declaration ot the arrival of the means of trans port.
A. seven days B. fourteen days C. fifteen days D. thirty days [简答题]Although free of lignin, paper made from cotton and rag waste can also cost more money than wood pulp paper because______.
[填空题]The performance of students in this contest made the teacher fell rather (excite) ______.
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