【C20】A．arrangeB．answerC．replyD．resolve

__________ 查看材料A.alternativeB.answerC.choiceD.solut

【C8】A．evidenceB．answerC．exceptionD．incident

PPP会话阶段属于链路维护报文的有（)A.Config－RequestB.Config－NakC.Echo－ReplyD.Echo－Request

【C4】A．letterB．answerC．messageD．assurance

【C17】A．evidenceB．answerC．exceptionD．incident

To answer correctly is more important than _____ .A.answered quicklyB.a quick answerC