operation unavailable on the current selection

As an AI language model, I cannot determine the context of your statement. However, "operation unavailable on the current selection" is a common error message that appears on computer programs or applications when a user tries to perform an action that is not possible with the current selection or in the current state of the program. This message can occur for various reasons, such as the user selecting an incompatible option, the program encountering a bug or an error, or the program lacking the necessary resources to perform the operation. The best course of action is to review the program's documentation or contact the support team for assistance.

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The full control and monitoring of equipment is performed through the master SAS terminals or the remote SAS terminal for the local AFC equipment. However, for backup control, there are mechanical switches in the GSCR of the master station and in the FCR of the satellite stations when the normal control from SAS is unavailable. The normal method of controlling AFC equipment shall be commands from the SAS terminal over a non-time critical segment of the Station LAN. The SAS shall be able to control the mode of operation of the AFC equipment for a group of stations, including master and satellite stations. These modes shall comprise normal operations and emergency operations, including special station events due to failed trains and conditions requiring full or partial suspension of fare collection. The SAS shall be able to provide 15 minutes traffic figure for monitoring.

AFC设备的完全控制和监控通过主SAS终端或本地AFC设备的远程SAS终端执行。然而，在SAS的正常控制不可用时，主站的GSCR和卫星站的FCR上有机械开关用于备份控制。控制AFC设备的正常方法应该是SAS终端通过车站局域网的非时间关键段发送命令。 SAS应该能够控制一组站（包括主站和卫星站）的AFC设备的操作模式。这些模式应包括正常操作和紧急操作，包括由于列车故障和需要全面或部分暂停收费的情况下的特殊车站事件。 SAS应该能够提供15分钟的流量数据以供监控。

Collecting package metadata (current_repodata.json): failed CondaSSLError: OpenSSL appears to be unavailable on this machine. OpenSSL is required to download and install packages. Exception: HTTPSConnectionPool(host='mirrors.tuna.tsinghua.edu.cn', port=443): Max retries exceeded with url: /anaconda/cloud/conda-forge/win-64/current_repodata.json (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available."))

这个错误提示是由于您的机器上没有安装 OpenSSL 导致的。OpenSSL 是一个安全套接字层密码库，许多 Python 包需要使用它来进行安全的网络通信。

您可以尝试通过以下命令安装 OpenSSL：

- 如果您使用的是 Ubuntu 系统，可以使用以下命令安装 OpenSSL：

  sudo apt-get install openssl

- 如果您使用的是 Mac 系统，可以使用 Homebrew 包管理器来安装 OpenSSL：

  brew install openssl

- 如果您使用的是 Windows 系统，可以从 OpenSSL 官网下载安装程序进行安装：https://www.openssl.org/community/binaries.html

安装完成之后，您可以尝试再次执行相应的 Python 命令，看是否能够成功下载和安装依赖包。