程控交换机的硬件主要分为三个系统:话路系统、控制系统和()。
参考答案:输入输出系统
He had learnd ___ such things, so he refused ___.
A.to do, being taught to
B.doing, to be taught to
C.to do, to be taught to
D.doing, being taught to
气滞血瘀多与何脏腑的生理功能相关。()
A.肺
B.脾
C.肾
D.三焦
E.以上都不是