简述基站功能。
参考答案：
固定不动接发移动台的信号完成与交换中心相连，从而实现移动台信号的收发。
We saw several natives advancing towards our party, and one of them came up to us, ____ we gave
some bells and glasses. [ ]
A. to which
B. to whom
C. with whom
D. with which
痰浊壅塞之胸痹的特点是
A．胸闷如窒而痛B．胸痛彻背，感寒痛甚C．胸部刺痛，固定不移D．胸闷隐痛，时作时止
