MGW中MP（main processor）用于（）
A.用户数据处理如语音编码
B.多功能设备MFD
C.处理信令和操作维护
D.内部同步
参考答案：C
.
--- It is said that you have given up your job as a secretary. Why?
--- The salary is OK, but I have got ___________ nothing in the office all the time.
A．tired of doing
B．tired with doing
C．tiring to do
D．tiring with doing
互斥关系是指各方案间具有（）。
A.层混性
B.相关性
C.独立型
D.排他性
