实现了数字交换和数字传输的综合称为（）。
参考答案：IDN
句型转换。
In the accident many people were killed, but meanwhile there were some who were unhurt.
In the accident many people were killed, but there were some who were unhurt.
在空白幻灯片中不可以直接插入______。
A．文本框 B．文字C．艺术字 D．Word表格
