Little introduction:- In main window you can select functionalities.
小简介：-在主窗口中，您可以选择功能。
The MFC classes provide enough functionalities for changing the main frame menu bar accordingly to the current active child frame.
为了依照当前活动子框架而改变主框架菜单栏，MFC类提供了充足的函数功能。
Quantum key distribution(QKD) network can be differentiated into three main categories based on different "family" of node functionalities:1)trusted relay node;
根据量子密钥分发网络节点功能的不同，可以将其分为三类：由信任方节点构成的网络；
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