Both bus and tree topologies are characterized by the use of multipoint （1）. For the bus, all stations attach, through appropriate hardware （2）known as a tap, directly to alinear transmission medium, or bus. Full-duplex operation between the station and the tap allowsdata to be transmitted onto the bus and received from the （3）. A transmission from anystation propagates the length of the medium in both directions and can be received by all other（4）. At each end of the bus is a （5）, which absorbs any signal, removing it from thebus.

（1）是（）

A.medium

B.connection

C.token

D.resource

设有下列程序：
#include＜stdio.h＞
#include＜string.h＞
main()
int i;
char s[10],t[10];
gets(t);
for(i=0;i＜2;i++)
gets(s);
if(strcmp(t,s)＜0) strcpy(t,s);

printf("%s\n",t);

程序运行后，从键盘上输入(＜CR＞代表回车符)：CDEF＜CR＞BADEF＜CR＞QTHRG＜CR＞，则程序的输出结果是______。