网络词汇中LAN是局域网,MAN是城域网,WAN是什么()
A.光纤网
B.令牌环网
C.广域网
D.英特网
参考答案:C
The boy isn’t old enough ________ with the difficult problem by himself.
A.deal
B.deals
C.dealing
D.to deal
怎样区别Fc、Fs与Fn?