单项选择题

A （） gives the creator of an original work exclusive rights to it, usually for a limited time.

A.trademark
B.copyright
C.monopoly
D.misrepresentation
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未分类题
在附壁紊流中，粘性底层厚度艿比绝对粗糙高度△大得多的壁面称为： A.水力光滑面 B.水力过渡粗糙面 C.水力粗糙面 D.以上答案均不对
A.水力光滑面
B.水力过渡粗糙面
C.水力粗糙面
D.以上答案均不对
单项选择题
A patent is a form of right granted by the government to an inventor, giving the owner the right to （） others from making, using, selling, offering to sell, and importing an invention for a limited period of time, in exchange for the public disclosure of
the invention.
A.provision
B.binding
C.infringement
D.exclude
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