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机要通信人员工作证的管理规定是什么？

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对本企业开发能力要求最高的系统开发方式是（）

A. 购买应用软件产品
B. 自行开发
C. 委托开发
D. 合作开发

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专利权起源于资本主义社会的财产权。

A. 正确
B. 错误

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You are upgrading your Cisco router IOS from a TFTP server over the network. The upgrade procedure is stopped and you are prompted to erase the current flash contents before continuing. What is most plausible reason for this? （）

A. There is insufficient room for more than one image.
B. The router has detected a copy of the current software image on the TFTP server.
C. The file can be relocated and not compressed.
D. The image to load is a binary executable file.

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以正弦跳汰周期为例叙述跳汰机周期的第四阶段。

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