许可证贸易
参考答案：
指通过签订许可合同，由享有专利产品、服务或技术的输出方将一定限度的生产和销售权出售给输入方，输入方支付给输出方专利权使用费。
__________ that it ranks 40 in the world .
A. So many talents has Tsinghua University produced
B. Such many talents has Tsinghua University produced
C. So many talents Tsinghua University has produced
数据流图中的4个基本成分是：数据流、对数据的加工、文件、 ______。
