在MPLSVPN中目前最常用的在PE和CE之间用来交换路由信息的动态路由协议是()、()、()。
参考答案:BGP;OSPF;RIP
已知f(x)=log3(3+x)+log3(3-x).
(1)求f(x)的定义域和值域;
(2)判断函数f(x)的奇偶性,并说明理由;
(3)写出函数f(x)的递增区间和递减区间.
-Could you give me an explanation ______ your keeping silent throughout the discussion?
-Oh, terribly sorry. I had the least idea of what ________. I would have made a complete fool
ofmyself if I had said anything. [ ]
A. for; was discussed
B. of; had discussed
C. to; was being discussed
D. with; had been discussed