多项选择题
Which three components are included in the Cisco IOS XR infrastructure？（）
A.modular line cards B.shelf controllers C.route processors D.service processors E.distributed service cards
单项选择题 HowmanymessagesdoesInternetKeyExchangeusetonegotiateSAcharacteristicswhenitrunsinaggressivemode？（）
多项选择题 WhichthreestatementsaboutNetFlowaretrue？（）
