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【简答题】
成熟红细胞的形状呈双凹圆盘状，中央较薄，周缘较厚。成熟红细胞无核和细胞器，胞质内充满_血红蛋白，具有结合和（）和（）的功能。
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举一反三
【单选题】_____ are established through patents, copyrights, and trademarks.
A.
Digital signatures
B.
Ownership rights over private property
C.
Origination fees and tributes
D.
Ownership rights over intellectual property
【多选题】Which of the following statements is true about patents and copyrights?
A.
They have benefits and costs.
B.
They lead to higher prices.
C.
They enhance the ability of monopolists to earn above-average profits.
D.
They lead to lower prices.
【简答题】机床部件中,能够直接影响到被加工零件轮廓形状的运动,统称为 运动。该运动由 和 组成。
【判断题】Patents, copyrights, and trademarks establish ownership rights over intellectual property.
A.
正确
B.
错误
【简答题】简单说说什么是方法的递归
【判断题】The basic tenet of the law of patents and copyrights is to encourage free exchange of ideas.
A.
正确
B.
错误
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