单选题Which of the following components is typically used for voice transmissions and has a 10Mbpsmaximum transfer speed?（）A 110 blockB Patch panelC Vertical cross connectD 66 block
题目
单选题
Which of the following components is typically used for voice transmissions and has a 10Mbpsmaximum transfer speed?（）
A
110 block
B
Patch panel
C
Vertical cross connect
D
66 block