多选题Cisco IOS CLI的上下文相关帮助功能为用户提供了哪两项功能？（）A当提交了错误命令时显示错误消息B显示当前模式中的所有可用命令列表C允许用户使用Tab键完成缩写命令的其余部分D确定已输入命令的可用选项、关键字或参数E选择用于完成任务的最佳命令
多选题
Cisco IOS CLI的上下文相关帮助功能为用户提供了哪两项功能？（）
A
当提交了错误命令时显示错误消息
B
显示当前模式中的所有可用命令列表
C
允许用户使用Tab键完成缩写命令的其余部分
D
确定已输入命令的可用选项、关键字或参数
E
选择用于完成任务的最佳命令
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