试说明10BASE5,10BASE2,10BASE-T所代表的意思。
查看答案
假定一个以太网上的通信量中的80%是在本局域网上进行的,而其余的20%的通信量是在本局域网和因特网之间进行的。另一个以太网的情况则反过来。这两个以太网一个使用以太网集线器,另一个使用以太网交换机。你认为以太网交换机应当用在哪一个网络上?
Those people __ a general understanding of the present situation.
A. lack of
B. are lacking of
C. lack
D. are in lack
Since last year, the crime rate in Chicago has sharply __.
A. declined
B. lessened
C. descended
D. slipped
A disagreement about boundaries is ___ the heart of the two country’s dispute.
A. at
B. of
C. in
D. by