在局域网与互联网的连接中,局域网最外端的路由器通常被称为()。
A.DDN
B.DTE
C.DLL
D.DCE
参考答案:B
She brought with her three friends, none of _____ I had ever met before. [ ]
A. them
B. who
C. whom
D. these
水火弯曲冷却后的温度控制在75~80℃。