单项选择题
When using keyboard shortcuts, which single keystroke combination allows users to erase the entire current command?（）
A. Ctrl + a B. Ctrl + e C. Ctrl + u D. Ctrl + w
单项选择题 Which statement is correct regarding exception traffic processing?（）
多项选择题 What are two functions of the RE?（）
单项选择题 Which statement is correct regarding the Junos OS?（）
