Which of the following protocols is commonly used for VoIP technology?()
A、Telnet
B、SMTP
C、SIP
D、SNMP
帧中继仅工作在物理层。
A、对
B、错
During a NIM install, the system stops with the LED code 611. What is the cause of the issue()?
A、A failure to NFS mount filesystems from the NIM client
B、A failure to NFS mount filesystems from the NIM master
C、A failure to retrieve the tftp client info from the NIM master
D、A failure to retrieve the tftp server info from the NIM master
预防小儿佝偻病,应口服维生素D剂量为每日()
A、100IU
B、200IU
C、300IU
D、400IU
E、900IU
熔断器的作用有()。
A、过流保护
B、短路保护
C、过压保护
D、欠压保护
新生儿破伤风最早出现的症状是()
A、张口及吸吮困难
B、牙关紧闭
C、全身痉挛
D、角弓反张
E、呼吸衰竭