在我国古老传说的人物中,被后人尊称为“人文初祖”的是[ ]
A.黄帝
B.尧
C.舜
D.禹
答案:A
— Do you suppose you could do it without help, Jack?
— ______.This is not the first time for me. [ ]
A. Not likely.
B. Not exactly
C. Don't worry.
D. I'm afraid not.
下列哪些网络设备的各个端口需要装配MAC地址?()
A.主机
B.集线器
C.交换机
D.路由器