phase 1
phase 2
phase 1 et phase 2
phase 3 et phase 4
第1题：
A. Optional authentication phase, link establishment phase, network layer protocol phase.
B. Network layer protocol phase, link establishment phase, optional authentication phase.
C. Network layer protocol phase, optional authentication phase, link establishment phase.
D. Link establishment phase, network layer protocol phase, optional authentication phase.
E. Link establishment phase, optional authentication phase, network layer protocol phase.
F. Optional authentication phase, network layer protocol phase, link establishment phase.
第2题：
A.GSM_PHASE_1
B.GSM_PHASE_2
C.GSM_PHASE_3
D.GSM_PHSAE_2+
E.GSM_PHASE_4
第3题：
Viruses usually have two phases to their execution, the infection phase and the(75)phase. The later phase is optional, since stone viruses simply reproduce.
A．reproduce
B．proliferation
C．defend
D．attack
第4题：
增强型全速率编码与全速率话音编码相比，能提供更好的话音质量。EFR采用了一种新的话音编码算法，能提供更好的话音质量，但是只有（）以上的移动台才支持EFR。
第5题：
第6题：
●In general,atypical (71) model is composed of several phases, such as requirements analysis phase, generaUdetailed design phase, implementation phase, system acceptance testing phase.
(71)
A. waterfall
B.incremental
C.spiral
D.prototyping
第7题：
A.GSM_PHASE_1
B.GSM_PHASE_1、GSM_PHASE_2、GSM_PHASE_2+
C.GSM_PHASE_2、GSM_PHASE_2+
D.GSM_PHASE_1、GSM_PHASE_2+
E.GSM_PHASE_2+
第8题：
A.Phase1
B.Phase2
C.Phase3
D.POSTPhase
第9题：
第10题：
GSM是数字蜂窝技术的一种标准，也称全球数字移动通信系统。分三个阶段实现，即（）。