单项选择题

Why does VOIP cost less

A．Because it uses separate service providers.
B．Because it needs less working stuff to offer service.
C．Because service is provided through e-mail.
D．Because service is charged monthly.

<上一题目录下一题>

热门试题

单项选择题

Which statement is NOT true about VOIP

A．It is the cheapest way of world-wide communication.
B．It is a good way to build strong relations.
C．It has the same quality as the traditional telephone service.
D．It uses a single network to transfer voice and dat

单项选择题

What does VOIP refer to

A．An Internet forum.
B．A technology of telephone service.
C．Communication via e-mail.
D．An Internet conferenc