不是局域网主要采用的传输介质的是( )。
A.双绞线
B.同轴电缆
C.光纤
D.微波
参考答案:D
解析: 局域网在网络传输介质上主要采用了:同轴电缆,双绞线,光纤。
纳米材料是由纳米颗粒经过特殊制备得到的。室温下外形相同的纳米铜比普通铜可多拉长50倍而不会断裂,表明纳米铜具有较好的:( )
A.导电性
B.导热性
C.延展性
D.弹性
I have no idea whether he has sisters, and if he does, _____?[ ]
A. how many sisters does he have
B. he has how many sisters
C. how many he has sisters
D. how many sisters he has