Which two items best describe a Cisco IOS IP SLA responder?()
A. required at the destination to implement Cisco IOS IP SLA services
B. improves measurement accuracy
C. required for VoIP jitter measurements
D. provides security on Cisco IOS IP SLA messages via LEAP or EAP-FAST authentication
E. responds to one Cisco IOS IP SLA operation per port
F. stores the resulting test statistic
“光谱方案”的学习活动分为4个类型()、()、()、()。
定子铁芯采用何种通风方式,采用氢气作为冷却介质有何优点(与空气作比较)?
进站信号机应设在距进站最外方道岔尖轨尖端(顺向为警冲标)不少于()的地点。
A. 50m
B. 60m
C. 80m
D. 100m