A. with B. by C. into D. about
A. of B. to C. by D. with
A. 屏蔽双绞线 B. 光纤 C. 同轴电缆 D. 无线设备
A. 网络层 B. 传输层 C. 会话层 D. 应用层
A. VDSL是非对称传输 B. HDSL是对称传输 C. SDSL是非对称传输 D. ADSL是非对称传输