(74) was designed many years ago,with a g
题型:单项选择题
问题:
(74) was designed many years ago,with a goal in mind:transmitting the human voice in a more-or-less recognizable form.
A.DWDM
B.PSTN
C.internet
D.WLAN
(74) was designed many years ago,with a goal in mind:transmitting the human voice in a more-or-less recognizable form.
A.DWDM
B.PSTN
C.internet
D.WLAN