第16题:[多选题]GPRS用户从开机到上网肯定经过的步骤包括()。
Which of the following flows are necessary from the time when a GPRS subscriber is powered on to the time when he uses services? ( ) A.GPRS Attach B.GPRS PDP Context Activation C.GPRS Routing Area Update D.GPRS Location Update 参考答案:AB