駝峰信號工駝峰信號工(高級)單項選擇題每日一練(2019.01.03)

A.240mm
B.250mm
C.260mm
D.270mm

A.shjkbk@online.sh.cn
B.shjkbk.online.sh.cn
C.online.sh.cn@shjkbk
D.cn.sh.online.shjkbk

A.ISP/SPX
B.PPP
C.TCP/IP
D.SLIP

A.53Hz～63Hz
B.55Hz～75Hz
C.63Hz～65Hz
D.65Hz～70Hz

A.≥15mA
B.≥20mA
C.≥25mA
D.≥30mA