回拨损耗测量反映的是电缆的阻抗一致性性能。
参考答案：对
一送多受轨道电路，同一道岔区段最多不应超过（）个接收端。
A socket is composed of two addresses: (72) 。
A．MAC address and IP address
B．MAC address and port address
C．port number and IP address
D．E-mail address and IP address
