多媒体通信的三个主要特征？

A. To keep all the members in the group work together．
B. To make the people there understand the meaning of work．
C. To find a way to solve the generation gap．
D. To help people enjoy their work．

A. 1、2、3号；
B. 2、3、4号；
C. 3、4、5号

A. 正确
B. 错误